Nevada Nugget Hunters

rehab · Joined: 15 Aug 2006 Posts: 939 Location: NEVADA

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rehab · Joined: 15 Aug 2006 Posts: 939 Location: NEVADA

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rehab · Joined: 15 Aug 2006 Posts: 939 Location: NEVADA

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rehab · Joined: 15 Aug 2006 Posts: 939 Location: NEVADA

for MARCH 30, 1934 3

UNITED STATES GEOLOGICAL SURVEY reports on

The Red Arrow Gold Discovery in Colorado
The gold discovery on the Red Arrow claim, in La Plata Mountains of Colorado, has created much interest in a district little known in miming literature. The Geological Survey made a brief examination of the property and presents the following report.

A recent discovery of gold at the Red Arrow No. 2 claim, in the La Plata Mountains of Colorado, has attracted much attention in newspaper accounts, and as the district in which this strike was made is little known in mining literature a brief account of the discovery and local geology will be of interest. This account is based upon a brief examination by two members of the United States Geological Survey, made in November 1933, and upon data furnished to them by the Red Arrow Gold Corporation, of Mancos, Colorado, the present operator of the property.

The discovery was made June 3, 1938, on the west side of Gold Run Draw about 500 feet northwest of the junction with the East Mancos River, in section 11, T. 36 N., R. 12 W. This region lies in Montezuma county a little more than a mile northwest of the La Plata county boundary line and about 8 miles east-northeast of the town of Mancos. Raymond and Charles Starr while panning small bars in Gold Run Draw obtained spectacular showings of coarse gold at a point in the creek just below the crossing of a small fissure in the Triassic red beds. Further search and panning up the west slope of the draw led to an examination of the first bedrock outcrop of the rocks, called “La Plata sandstone” in early reports on this region, which overlie the red beds, on the slope well above the bed of the creek. This outcrop, which was comparatively small, proved to contain coarse gold embedded in oxidized vein material in the sandstone.

Since the discovery a small open cut has been made at the surface outcrop, and just below this cut a tunnel has been driven west on the fissure about 110 feet into the hillside. The fissure strikes about due east and dips 60 degrees-10 degrees south at the tunnel. According to the owners the vein has been traced for about 800 feet. The tunnel is about 9,100 feet above sea level and appears to have been driven into the upper sandstone member of the La Plata sandstone at a position 50 to 75 feet above the thin limestone that divides the La Plata into two parts.

The vein and fissured zone as exposed in the tunnel has a width of two to five feet, with an average of three to three and one-half feet. Sandstone county rock composes both hanging wall and footwall and is noticeably fractured and seamed on the hanging-wall side. The vein material is partly friable, porous, and oxidized, and the gangue is composed chiefly of barite with some fragments of the sandstone country rock. Some of the ore contains small amounts of partly oxidized sulphides, among which pyrite, chalcopyrite, and chalcocite can be recognized, and these are seamed by the oxidation products malachite, azurite, and limonite. There Is also a small amount of a clayey substance, possibly a variety of kaolin. The barite and sandstone are locally seamed and stained by these oxidation products. At the breast of the tunnel, over which there is a back of about 50 feet, the center of the vein consists chiefly of massive interlocking barite crystals between which there are vugs and openings filled with limonitic material. This portion of the vein is essentially free of sulphides or of the stain of secondary copper minerals, indicating that the original sulphides had filled in between only portions of the original barite vein material.

As reported by the owners the gold occurs chiefly on the hangingwall or foot-wall. In specimens seen at the property the gold was associated with partly or nearly completely altered sulphides. One streak of ore along the hanging wall is reported to have run from 1 to 8 ounces of gold to the ton and where mined ranged from 20 to 30 inches in width. The foot-wall streak is in places eight to 12 inches wide and contains the coarser nuggets of gold. This coarse gold occurs in platy or foliated form, and pieces were found from a few grains up to eight ounces in weight.. Screenings from this streak yielded 4.4 ounces of gold and 15.8 ounces of silver to the ton. Whether the silver occurs entirely alloyed with the gold or partly in some other form is not known, and none of the specimens examined yielded any information on this point. The owners report a production of 21 tons of ore, yielding $5,441.14, but state that they are holding some of the foliated gold which had not been marketed.

Sufficient development work has not been done to show the primary occurrence of the gold in this locality. The limonitic material was tested and found to contain only traces of manganese, the presence of which is supposed to favor the possibility of slight solution and migration of gold. The coarse form of part of the gold does not favor the possibility that it was derived entirely from oxidation of tellurides, which usually yield a finely divided ‘‘mustard” gold. However, tests carried out on the limonite and partly oxidized sulphides showed the presence of small amounts of tellurium and probably traces of selenium. This would seem to indicate that at least some of the original vein minerals were tellurides of gold, or of gold and silver that have been largely or completely destroyed. Tellurides are known to decompose easily under these near-surface conditions to tellurium oxide or tellurates of iron. Tests of limonite apparently free of visible gold also showed the presence of traces of gold.

Much of the fine or invisible gold thus may have resulted from the destruction of tellurides and pyrite. The large nuggets of gold were more likely formed by slight migration of dissolved gold and its adherence to particles or plates of primary native gold. The concentration at the discovery shoot could thus be due to several factors. First, and probably the most important, the volume decreased through oxidation; second, because of the porosity of the vein material some fine gold may have been carried down mechanically with colloidal and dissolved oxides of iron; finally, a little gold may have been carried in solution or in the colloidal state slight distances and formed the larger nuggets by accretion.

The East Mancos River, near which this discovery was made, rises four miles to the northeast, near the center of the La Plata Mountains. These mountains are the result of a domal uplift that is considerably modified by its position on the southwestern flank of the much broader San Juan uplift, and numerous crosscutting intrusive bodies and sills locally affect the attitude of the strata. The inclined strata dip, in general, away from the central higher areas, and along the East Mancos River near the Red Arrow dip about 10 degrees-12 degrees southwest, but not far above the mine local dips of 30 degrees-40 degrees are superimposed upon this regional dip. Existing maps and literature assign a comparatively minor part to faulting in this area. The principal mapped faults are the east-west Menefee and Parrott faults, In the southern part of the uplift, and a series of faults north of the uplift that strike about N. 60 degrees E’. The down-thrown sides of the faults are generally away from the center of the dome. A few north-south breaks and several northward-trending breccia zones as much as several hundred feet in width are known. These breccia zones may represent fault movements.

The sedimentary rocks exposed in the La Plata uplift, beginning with the oldest formation cropping out in the center of the mountains, comprise (1) the Cutler formation, of Permian age, which consists of arkosic sandstone, conglomerates, and shales of predominating dull red color and of which about 1,200 feet, representing only a part of its total thickness, is exposed; (2) the Dolores formation, of Triassic age, a series of reddish sandstones, grits, and conglomerates of somewhat brighter color than the Cutler and 800 to 500 feet thick, some of the conglomerates containing small limestone pebbles; (3) the Entrada sandstone, of Upper Jurassic age (the lower sandstone member of the La Plata sandstone of older reports), a massive cliff-forming friable white sandstone which is strikingly cross-bedded, 150 to 200 feet thick; (4) the Morrison formation, of Upper Jurassic age, about 550 to 700 feet thick, a complex of alternating yellow or gray sandstones and variegated shales, with some calcareous beds; the lower 150 to 200 feet is a white sandstone which contains several thin shale’ partings and a layer of dark limestone eight to 30 feet thick at its base; this is the sandstone in which the tunnel on the Red Arrow is driven and corresponds to the’ upper sandstone member of the La Plata sandstone of older reports; (5) the Dakota (?) sandstone, of Upper Cretaceous age, a gray or rusty-brown quartzose sandstone 100 to 300 feet thick with a variable conglomerate, which contains small chert pebble, at or near the base, and carbonaceous shale partings at several horizons; (6) the Mancos shale, of Upper Cretaceous age, 1,200 feet thick, a dark gray or almost black soft carbonaceous or clay shale that contains thin lenses or concretions of limestone. Above the Mancos shale are considerable thickness of the Mesaverde formation and Lewis shale, but these lie largely beyond the local effects of the La Plata uplift.
The igneous rocks of the La Plata uplift are all intrusive; surface flows of lava such as cover much of the San Juan u p lift to the northeast are entirely lacking. Near the center of the uplift there are plugs of diorite or monzonite, which cut across earlier porphyritic sheet and dikes.
The La Plata uplift probably corresponds in age and origin to the centers of mineralization and igneous activity in the Rico and Ouray districts, which are older than the great eruptive centers that formed the lava-covered mountains of the San Juan region.
The mineral-producing area of the La Plata Mountains, sometimes known as the California District, is mostly in La Plata County but extends westward and includes part of Montezuma county. The production of the La Plata District to the end of 1933 is $3,923,536 in gold, and $1,226,651 in silver. Small amounts of copper and lead have also been produced.
The ores of the mountains as a whole occur in well-defined veins or in irregular lens-shaped bodies in fissured zones. According to older reports three well-marked sets of fissures occur east-west, northeast, and northwest. The northeast set is distinguished by a large number of zones of crushed rock, cemented by quartz and sulphides. The strongest veins are in the east-west and northeast sets. The veins are commonly tight and narrow in the shale beds but increase in size and productivity in some of the porphyries and sandstone beds.
The principal ore minerals are the tellurides of gold and silver, but other minerals reported include native gold, amalgam, freibergite, tennantite, stephanite and other sulphantimonides and sulpharsenides of silver, pyrite, marcasite, chalcopyrite, galena, sphalerite, realgar, cinnabar, magnetite, and hematite. The gangue minerals include quartz, chalcedony, calcite, rhodochrosite, dolomite, barite, fluorite, chlorite, sericite, kaolin, and numerous minerals formed by metamorphism of the sedimentary rocks near intrusive bodies.
The ores are in general of two kinds— the telluride ores and the ores containing gold associated with pyrite or in native form. The ores of the district that are not telluride ores are largely of low grade. In several places veins follow and partly replace the dike rocks. The gold content in the high grade veins tends to be spotty, but very rich pockets have been discovered.

rehab · Joined: 15 Aug 2006 Posts: 939 Location: NEVADA

AMJ AUGUST 15, 1931

J. G. CLARK ENTERPRISE PLACES PERIGO MINE ON PRODUCTION

Gold bullion is being shipped to the Denver mint regularly from the Perigo gold mine, near Rollinsville, Colorado. While the mill is capable of treating 100 tons of ore daily and the mine likewise has ore to supply that tonnage, it is operating only 16 hours daily and is handling approximately 40 tons in that time. A recovery of close to 50 per cent is being made by amalgamation and the residue is sub jected to gravity concentration and rag tables. Each ton of concentrates represents a little more than 10 tons of crude ore, and reduces the costs of freight and treatment in that proportion. The concentrates are sold through the Boulder Public Sampling Works to the Golden Cycle mill at Colorado Springs.
The Perigo is one of the old mining properties in the district and has been in operation a number of years. It comprises 23 patented claims, covering about 6,000 feet of the main vein system. The main central tunnel is 900 feet long and approximately 2,000 feet of drifts have been run on the veins. While large production has come from these workings, there is still a vast tonnage that will supplement the reserves that are being blocked out on a new level 100 feet below. This new level is reached by a 600-foot shaft sunk from the surface and which will prove an economical feature in the mining system.
Scarcely two years ago, American Mines and Smelting Company became interested in the Perigo mines, and under its aggressive policies and with the necessary capital-the enterprise was soon on its feet. Nels Olsen controlled the property for a number of years. He had made extensive explorations and had valuable data at his fingertips, and was taken into the mining and smelting company as mine superintendent, by J. G. Clark of Boulder, president and general manager of the enter--price. The underground workings were restored and the mill, which had been maintained in excellent condition, was equipped with modern equipment and for higher efficiency.

rehab · Joined: 15 Aug 2006 Posts: 939 Location: NEVADA

32 THE MINING JOURNAL 8-15-1931

COLORADO

The first unit of a development project common to the Enterprise group of mines and to the Little Clara of the Doctor Jack Pot Gold Mining Company in the Cripple Creek district in Colorado, has been awarded by J. 0. A. Carper, Boston Building, Denver, and associates, who have a lease and bond on the two properties. E. P. Arthur of Cripple Creek is in charge of the work. This contract covers 150 feet of drifting, which will be carried on through the Ophelia tunnel. Later, the raising and sinking of a shaft in the Enterprise may be projected.

Colorado Gold, Inc., Evan Williams, Cripple Creek, Colorado, has opened three stopes in the Colorado City property, and the No. 8 is showing up best so far. The ore is getting richer as the drift in the No. 5 is advanced and there are 300 feet of ground ahead before reaching the end lines of the property. One carload of screenings are accumulated with every three carloads of coarse rock and three or four carloads are shipped to the Golden Cycle mill each week. The income is returning a profit above all expenses, in spite of the fact that there is a lot of dead work being done and some re-timbering being done in the stopes. The last carload of screenings sold netted $213, after paying all expenses including a $43.50 bill for air and blacksmith work.

Jack Boyde and Ross Parker are said to have accumulated 60 sacks of rich gold ore from their lease on the Reveille lode on Farncomb Hill in the Breckenridge district in Colorado. Farncomb Hill is widely known as a producer of crystallized and wire gold and the Reveille lode, discovered in the middle ‘50s by the late Dan W. Dean, is now in the possession of the Royal Tiger Mine. Company.

J. F. Ensley and associates are erecting surface buildings and a headframe over the shaft, at the Red Umbrella property on Raven Hill in the Cripple Creek district, Colorado. An electric hoist and compressor have been ordered and it is planned to repair the shaft to a depth of at least 150 feet, from which point laterals will be driven to the side lines.

The Edgar-Belman Mines Company, George Schott, superintendent, Idaho Springs, Colorado, has shipped its initial carload of high-grade ore. A substantial tonnage of milling ore is broken and will be moved as soon as the local mill can handle it. Four men are working and arrangements are being made to increase the crew and to purchase more equipment for enlarged production, and to speed up development west on the Stanley vein.

The Queen Bee mine on Porphyry Mountain, not far from Gunnison, Colorado, has been named the Baco No. 1 and is being prepared for work, according to Fred Cochran, one of the owners. John Coban has been engaged as superintendent. It is a gold-bearing mine at an altitude of 13,500 feet and has a combination of lime, quartz and porphyry ores.

The Columbine Gold Mining Company, Inc., M. A. Meenan, president, Dolores, Colorado, is sampling its property at Vance Junction and is getting an average of 1 ounce of gold. The main vein is a 12-foot width that has all the earmarks of a producer.

The new 50-ton Tiller type concentration and separation plant of the Texward Mining and Milling Company, in the La Plata Mountains, out from Durango, Colorado, made its first run. Officials of the company were present and were well pleased with what they saw- Concentration was in the ratio of 35 to 1 and 50 to 1, and the concentrates were worth $800 and $1,000 a ton. From 10 to 20 cents a ton went into the tailings, according to information given out by company officials. More than 2,000 tons of ore have been placed on the dumps of the Texas Chief and Ward properties, and thousands of tons are blocked out. Three shifts will be engaged in milling as soon as the mill is running smoothly, probably early next month. At the present time, it is said; nothing is foreseen to delay the construction of a similar unit in six months’ time.

The Buffalo Exploration and Mining Company at Breckenridge, Colorado, is making tri-weekly shipments of gold to the Denver mint. The machine is capable of treating 60 cubic yards an hour, this including whatever will go through the ‘A-inch mesh. In present operations about 60 per cent of the gross material is being run through the machine and from 1 to 1.5 ounces of gold are recovered an hour.

Louis D. Roatcap has returned to Montrose, Colorado from the old Roscoe Conklin mine in the Upper Cimarron county, purchased last January by his father, where he has spent most of the summer. He is displaying samples of free gold and tellurium ore and is having a mill run sample assayed. The Roatcaps also own the Pay Day placer, close to the Conklin mine, and a crew are installing sluice boxes and getting ready to recover gold.

The Townsend Lead and Zinc Corporation, controlled by H. Lee Townsend, 1440 Corona Street, Denver, Colorado, has taken over the Ezra H. and other claims in Arrastra Gulch, near Silverton, Colorado.
I. J. Wing of Victor is in charge of the property and 0. E. Wing is in charge of overhauling the mechanical equipment. Development and the mining of ore will be started as soon as the preliminary work has been done. This company controls the Empire Chief property on Henson Creek, near Lake City, Colorado.

Preparatory to engaging in an extensive development campaign, the Western States Mining Company, John C. Martelon, manager, Colorado Building, Denver, is overhauling the machinery at the Centennial mine at Georgetown. It is planned to double the capacity of the mill and to electrify the mine workings so as to improve the method of handling ore. Nearly 60 days will be taken up in this work. The mine program includes opening up the 600-foot level and drifting southwest, and diamond drilling from both the 500 and 600 levels to a depth of probably 1,000 feet.

The Queen of the West mines at Kokomo, Colorado, is slated for new development under the management of the Continental Consolidated Mines Company, organized by John W. Springer of Denver, president of the Continental Trust Company. Finances to go ahead with work are coming from New England, and the Continental Trust Company is trustee for the operating company.
The property covers several hundred acres on the Jacque Mountain, immediately opposite the Climax Molybdenum Company, the largest molybdenum operator in the United States, and in places molybdenum ore, similar to the Climax, is found. Exhaustive tests have been made on the Queen of the West ores and are said to have averaged $50 a ton in gold, silver, lead and zinc. Suitable reduction units will be constructed as the development of the mines warrant.

L. F. LeBrun, well known in local mining circles, has taken a bond and lease on the Pythias- Leland Stanford-Hart group of claims in the Cripple Creek district, between Ironclad and Bull Hills. The block comprises approximately 78 acres on the contact and is about the last parcel of virgin ground in the north area.

The Cresson mine in the Cripple Creek district in Colorado is shipping about 300 tons daily, and is the largest shipper in the district. At Victor, the Granite Company is developing a high-grade shoot and getting a net of close to $15,000 a month. Other shippers in the district are the Rose Nichol, 100 tons daily, the Vindicator, 200 tons daily, the Pinnacle, 50 tons daily, and the lessees on the School Section, from 100 to 200 tons daily.

Night and day shifts are making big progress on the Winchell mine, located a mile below the abandoned town of Stunner, Colorado, and two and one-half miles southeast of Summitville, where the famous Little Annie mine is located. A tunnel is being driven 150 feet to cut the vein below a shaft that was sunk partially in 1890, and in which high-grade gold ore was found at that time, but for various reasons operations were suspended; possibly on account of a large body of water which was encountered in the shaft. It is a contact vein and will in all probability be reached by September 10. Mr. Winchell is a Monte Vista, Colorado, man, and may be reached at 421 First Avenue.

Patterson and associates of Del Norte, Colorado, have acquired the Old Lot mine in the White Earth district in Gunnison county, from B. L. McKnight of Canon City and Messrs. Jensen, Liska and Baker of Lake City. The old 300-foot shaft sunk 80 years ago is being cleaned out and 125 feet of its length have already been re-timbered. A 10-stamp mill is on the ground.

Robert Eberle of Denver and associates have hauled two electric motors to the Fauntleroy mine in the Moffat tunnel at Cripple Creek, Colorado, and intend to start work immediately. Because of poor ventilation and bad air, a special electric air circulating system is being installed, and one of the motors will be used to run the fan. The other motor will be used to run the hoist.

The Empire Chief Mining Company, H. Lee Townsend, general manager, 1440 Corona Street, Denver, Colorado, is considering resuming work in the Chicago tunnel. The work will be directed to cutting the Pearl and Ruby and other important producing veins.

The Colorado Iron Works is putting in another 500-ton mill unit for Chain 0’ Mines, Inc., at Central City, Colorado. The mining company is treating between 11,000 and 12,000 tons daily and the new unit, which will be in operation about August 10, will bring the production up to around 15,000 tons daily. R. P. Akins, 1324 Fillmore Street, Denver, with the machinery company and consulting engineer for the mining company, is in charge of the construction. Chain 0 Mines is getting ready to work the California mine dump - on Quartz Hill and will start work as soon as the Public Service Company has finished building a power line to the dump.

Thomas McGrath of the -Gold Patch Mining Company at Idaho Springs, Colorado, has installed a flotation machine in the Dump mill he has lately acquired between Central City and Black Hawk. The machine was built in Denver and trucked over the mountain to the mine by the Curnow Transportation Company. Mr. McGrath reports that the mill is running perfectly on Gold Patch ore.

The Tar Heel Mining Company is putting in a 360-foot compressor and making other improvements to speed up its work on the Lincoln mine at Idaho Springs, Colorado. Ten men are working at the present time, and have just shipped a carload of hand-sorted ore of good grade. G. R. Sandus is president and general manager and Norman Horlick, superintendent.

A group of Colorado Springs men have organized the Superior Gold Mining Company, which has taken over the Aileen, Grace Greenwood and Rattler mines, located between Cripple Creek and Victor, Colorado. William A. Casson is president of the company, John C. Twombley is vice-president and Fred N. Bentall is secretary/treasurer.

rehab · Joined: 15 Aug 2006 Posts: 939 Location: NEVADA

THE MINING JOURNAL FOR NOVEMBER 30 1929

Comeback of West Gold Realized In Three Years

Mining history is full of stories of old properties, which later—sometimes after years of abandonment—produced new millions. It is not so replete with the histories of comebacks on the part of companies, which were on the verge of bankruptcy. West Gold Mining Company is an outstanding example of that kind.

Less than three years ago, West Gold held certain properties under bond and lease in the Chicago Creek District of Idaho Springs, Colorado. These properties were held in high esteem by mining engineers, but the affairs of West Gold itself were so involved as to cause many to believe that the company would never be able to do anything with them. Over $45,000.00 in debts were posted against the company, as were about fourteen suits pending in court. The company was further hit by the untimely death of its president, Mr. N. S. Clarke.

Today, under the leadership of J. A. Hinds, mining engineer and president of West Gold, the company is out of debt, excepting as to production notes to stockholders; has a mill building, with capacity of 500 tons ore daily, completed; is moving in machinery for the first 75-ton unit cyanide plant; and expects to enter the active production lists before the last of November. Mill building, machinery, and labor are all paid for. The company announces that it has a total estimated tonnage of 2,780,500 tons of ore blocked out and ready to be broken, and about 111,000 tons of ore on the dumps or broken in the stopes. Furthermore, on March 10, 1929, payments were completed on the properties, and they are now owned outright. In the mine itself, there are about 5,686 feet of development, and work consisting of tunnels, drifts, stopes, and a 250-foot shaft.

A test of 57 tons of ore made by the Portland mill at Cripple Creek, Colorado, showed assay values running from $9.60 to $11.60 per ton. According to tests, the company expresses its belief that all overhead coincident with the mining and milling, will come under $2.50 per ton, which would show a profit on the figures above.

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rehab · Joined: 15 Aug 2006 Posts: 939 Location: NEVADA

for JANUARY 15, 1930

JEFFERSON COUNTY, COLO., CLAIMS HONOR OF HOLDING BERYL

A deposit of beryl has been uncovered, about 12 miles from Golden, Colorado, and according to State Mine Commissioner John T. Joyce, and officials of the Sarsfield Mining and Milling Company, will be investigated. Preliminary tests show 4 percent beryllium, and a comprehensive survey is said to be already under way.

Interest in beryl and beryllium has grown rapidly on account of its strength and lightness, which make it extremely suitable in the construction of airplanes. Beryllium is quoted in the United States at around $200 a pound at the present time.

In the United States the metal has been produced on a semi-commercial scale by one concern. While this company has devoted some attention to the heavy alloys, chiefly those of beryllium with gold and silver, its chief interest has been with beryllium-aluminum alloys. It has been stated that the addition of beryllium to aluminum increases its strength and resistance to corrosion, and that an alloy containing 70 percent beryllium, and 50 percent aluminum, exhibits materially greater resistance to salt water and air corrosion, than any other light alloy.
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rehab · Joined: 15 Aug 2006 Posts: 939 Location: NEVADA

for JANUARY 15, 1930

SHENANDOAH-DIVES MILL GOES INTO OPERATION

Before the end of this month, the Shenandoah-Dives Mining Company, at Silverton, Colorado, will place its new mill in operation. This is the culmination of four years’ persistent efforts on the part of Charles A. Chase, and James W. Oldhani, of Kansas City, who have shouldered the financial and engineering burdens, respectively.

The mill was designed by Arthur J. Weinig, who has studied the ore throughout development. Two-stage crushing at the mine permits the use of a single Marcy mill, for 800 tons. Wilfley tables, at two points, will make lead concentrate, which will be amalgamated for its gold.

Flotation will make principally a 15-20 percent copper froth, with some lead, which may be amalgamated. A second froth of Iron and copper, will be reground, and re-floated, for the copper.

Mill heating will be from mill water flows, heated with the exhaust steam from a small turbine. This will furnish lights, and limited power; major power requirements to be met by the Western Colorado Power Company. Tailings will be drawn from a 50-foot thickener, and the decanted
warm water returned. The mill building, for two 800-ton units, and equipment for the first of these units was furnished by the Stearns-Roger Manufacturing Company.

All of the mechanical plant is planned for minimum cost operation. Stope excavation is to be confined to the day shift, the heavy compressor load thus entailed, being offset by two-stage crushing, and haulage on the night shift. Track gauge of 30 inches, is to give stability to 3-ton cars. The use of storage-battery locomotives, will avoid trolley wires, and track bonding. The cable tramway, 10,000 feet in length, has been designed by Fred C. Carstarphen, who is referred to in another section of the magazine. Structures and cables are ample for 80 tons hourly, thus limiting operation to the day shift.
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rehab · Joined: 15 Aug 2006 Posts: 939 Location: NEVADA

THE MINING JOURNAL 1 15 1930

RESUMED ACTIVITY OF THE COLORADO-NEW MEXICO MINING CO.

Underground development of the Colorado-Mexico Mining Company at Silverton, Colorado, has been confined largely to un-watering the deepest mine of the Iowa-Tiger Group; sinking to prove the persistence of ore at depth, and drifting on the vein to develop stoping ground. A depth of 100 feet below the 400-foot level, has been reached and 700 feet of drifting done on the vein at that depth.

The mill, known as the Iowa, was taken over under lease more than a year ago by the Shenandoah-Dives Mining Company, and new equipment, consisting of a ball mill, tables and flotation, installed. That company operated the mill at 100 tons’ daily capacity since that time. during their period of development, and at the same time, the mill treated some ore developed by the Colorado-Mexico Company. Whereas, extraction in the old mill did not average more than 50 per cent of the combined gold, silver, lead, and copper, the new installation yields an average of more than 90 percent of the metallic content of the ore.

The Shenandoah-Dives Company has completed a new mill of 300-ton daily capacity, and on December 15, the Colorado-Mexico took over its own mill for operation. Initial mill operations will be treating 75 tons daily, and early in this year this tonnage will be increased to about 100 tons daily.

Besides drifting on the vein on the 500 level, ore is being broken in shrinkage stopes. A recent important discovery is an unexplored vein, from two to four feet wide at its junction with the Melville vein. High gold content is found in the ore and, if it continues to the surface, will add greatly to the known reserves in the mine.

In addition to the development outlined, the tramway, two miles in length, has been repaired of the damage caused by snowslides last winter. A new traction cable is being put in.

I. Partanan, formerly superintendent at the Black Bear Mine at Telluride, has been engaged as mine superintendent; and H. A. Hansen, for several years mill superintendent at the Tom Boy mill, also at Telluride, has been engaged as mill superintendent.
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