Mazuma Hills Mine

Site Name

Primary: Mazuma Hills Mine
Secondary: Mazuma Hills Group
Secondary: NBMG Sample Site 2817
Secondary: Reagan Mine Adjoining
Secondary: Lookout Claims
Secondary: Outlook Claims

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Commodity

Primary: Gold
Secondary: Silver
Tertiary: Antimony
Tertiary: Copper
Tertiary: Lead

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Location

State: Nevada
County: Pershing
District: Seven Troughs District

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Land Status

Land ownership: BLM Administrative Area
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.

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Holdings

Not available

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Workings

Not available

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Ownership

Owner Name: Mazuma Hills Mining Co.
Years: 1930 -

Owner Name: Nevada State Gold Mines Co.
Years: 1930 -

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Production

Not available

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Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1907
Discovery Year: 1905
Years of Production:
Organization:
Significant: N
Deposit Size: S

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Physiography

Not available

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Mineral Deposit Model

Model Name: Epithermal vein, Comstock

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Orebody

Not available

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Structure

Not available

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Alterations

Alteration Type: L
Alteration Text: Two Periods Of Alteration; An Early Pervasive Propylitic Event And A Second Argillic Alteration.

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Rocks

Name: Rhyolite
Role: Associated
Age Type: Host Rock
Age Young: Pliocene

Name: Rhyolite
Role: Associated
Age Type: Associated Rock
Age Young: Pliocene

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Analytical Data

Analytical Data: SAMPLE 2817 FROM MAZUMA MINE DUMPS, SULFIDE-RICH RHYOLITE BRECCIA, CONTAINS 7 % FE, 2 % MG, 15 % CA, 0.7 % TI, 1000 PPM MN, 1.5 PPM AG, 0.15 PPM AU (BY AA ANALYSIS), 10 PPM B, 3000 PPM BA, 1.5 PPM BE, 20 PPM CO, 15 PPM CU, 70 PPM LA, 20 PPM MO, 7 PPM NI, 100 PPM PB, 20 PPM SC, 300 PPM SR, 150 PPM V, 50 PPM Y, 200 PPM ZR.

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Materials

Ore: Chalcopyrite
Ore: Electrum
Gangue: Pyrite
Gangue: Chlorite
Gangue: Quartz
Gangue: Calcite

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Comments

Comment (Workings): ADIT, SHAFT, WINZES

Comment (Deposit): ORIGINAL M060225 HAD NO REFERENCES. ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT; 3 FIELD OBSERV

Comment (Location): ON NORTH SIDE OF SEVEN TROUGHS CANYON ENTRANCE. CANYON IS ON EASTERN FLANK OF SEVEN TROUGHS RANGE. UTM IS TO SAMPLE SITE 2817 AT ONE OF LARGE DUMPS. . INFO FROM LAND.ST :(1972)

Comment (Production): LATER PRODUCTION WAS PROBABLY LUMPED WITH SEVEN TROUGHS COALITION MINING CO.

Comment (Development): DISCOVERED IN 1905, BUT NOT MUCH DEVELOPED UNTIL 1907 WHEN MAZUMA HILLS MINE OPENED. MAZUMA HILLS MINING CO. WAS ONE OF THE 3 MAIN MINING CO. ACTIVE DURING THE MAIN PRODUCTION PERIOD FROM 1908 TO 1916. MAZUMA HILLS MILL WAS BUILT IN 1908 NEAR THE MOUTH OF THE CANYON BELOW THE MINES, AND ALTHOUGH IT SURVIVED THE 1912 FLOOD THAT WIPED OUT THE TOWN OF MAZUMA, BUT BURNED DOWN 13 DAYS LATER, ON 13 JUL 1912. IN 1917, THE LOWER LEVELS OF THE MAZUMA HILLS MINE WERE FLOODED (AS WERE THOSE OF THE SEVEN TROUGHS COALITION) AND COULD NOT BE DRAINED, LEADING TO CLOSURE OF THE MINE. FRIEDMAN STARTED A `DEEP TUNNEL' TO DRAIN THE MINES IN 1919 WITH SLOW PROGRESS UNTIL 1926 WHEN, AFTER SEVERAL REORGANIZATIONS AND CLAIM ACQUISITIONS, WORK BEGAN IN EARNEST AND BY MARCH 1928, IT WAS 5495 FEET LONG AND A NEW POWER PLANT HAD BEEN INSTALLED. BY MARCH 1929, TUNNEL WAS 7200 FEET LONG AND EXPECTED TO CUT THE COALITION VEIN IN 200 FEET. BY 1930, MAZUMA HILLS MINING CO. WAS PART OF THE SEVEN TROUGHS GOLD

Comment (Deposit): THIS RECORD HAS BEEN MERGED WITH MRDS RECORD M242812, WHICH HAS BEEN DELETED.

Comment (Deposit): VEINS ARE SOFT CRUSHED MATERIAL WITH MOVEMENT SINCE ORE DEPOSITION. TYPICAL QUARTZ IS FRIABLE OR SUGARY. IN RICH ORE, GOLD WAS VISIBLE AS CLUSTERS OF SMALL IRREGULAR PATCHES OR AS COARSE CRYSTALLINE AGGREGATES. REAGAN MINE IS ON A SPEARATE VEIN FROM MAZUMA HILLS, BUT BOTH WERE ADJACENT AND HELD BY SAME COMPANY DURING PRODUCTIVE YEARS. VEINS ARE PARALLEL AND ABOUT 40 FEET APART. BOTH MAZUMA HILLS AND REAGAN VEINS FOLLOW BASALTIC DIKES VARYING IN WIDTH FROM A FRACTION OF AN INCH TO GREATER THAN 6 FEET. BEST ORE WAS ON THE FOOTWALL (EAST) SIDE OF THE DIKE IN BOTH THE TUFFACEOUS COUNTRY ROCK AND IN THE BASALT. NETWORK OF INTERCONNECTING QUARTZ VEINS AND VEINLETS ALONG FISSURES AND PARALLELLING DIKES IN THE RHYOLITE. FAULTS AND STRINGERS CROSS THE MAIN N-S VEIN TREND.

Comment (Development): MINING CO. WHICH ALSO COMPRISED SEVEN TROUGHS COALITION, CLEGHORN, SUGNAL PEAK, GOLD CUP, SEVEN TROUGHS GOLD MINING CO. AS WELL AS OTHERS, COVERING 2400 ACRES. THE TUNNEL WAS 10,000 FEET LONG BY NOVEMBER 1929, WITH SOME SIDE DRIFTING AT THE 5100-FOOT STATION AND ELSEWHERE. IT EVENTUALLY DID CONNECT WITH THE TYLER SHAFT AND DEEP PORTIONS OF THE COALITION MINE BUT AT A MUCH SHALLOWER DEPTH THAN ORIGINALLY INTENDED, TOO HIGH TO DRAIN THE DEEP WORKINGS. AS A MATTER OF FACT, WITH THE ELEVATION OF THE DEEP TUNNEL PORTAL SO HIGH, IT WAS IMPOSSIBLE TO DRAIN THE LOWER WORKINGS ANYWAY - IT WAS A PROMOTIONAL SCHEME. BY 1930, NEVADA STATE GOLD MINES CO. HAD GAINED CONTROL OF MOST OF THE MINES. IN 1934, IT WAS THE LARGEST GOLD PRODUCER IN PERSHING COUNTY; IT LEASED ITS MILL AND CYANIDE PLANTS AND MOST OF THE ORE PRODUCED CAME FROM THE OLD MINE DUMPS.

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References

Reference (Deposit): QUADE, JACK, 6 SEP 84, NBMG FIELD EXAMINATION AND SAMPLE ANALYSIS.

Reference (Deposit): NBMG STAFF, 1985, A MINERAL INVENTORY OF THE PARADISE-DENIO AND SONOMA-GERLACH RESOURCE AREAS, WINNEMUCCA DISTRICT, NEVADA: NBMG OFR 85-3.

Reference (Deposit): BRUCE, W. R., 1980, GEOLOGY AND MINERAL DEPOSITS OF THE SEVEN TROUGHS MINING DISTRICT; PERSHING COUNTY, NEVADA.; SOCIETY OF ECONOMIC GEOLOGISTS FIELD TRIP GUIDE, UNPUB.

Reference (Deposit): JOHNSON, M. G., 1977, GEOLOGY AND MINERAL DEPOSITS OF PERSHING COUNTY, NEVADA: NBMG BULL. 89, P. 87-89.

Reference (Deposit): SHAMBERGER, H. A., 1972, THE STORY OF SEVEN TROUGHS, PERSHING COUNTY, NEVADA - HISTORIC MINING CAMPS OF NEVADA; NO. 3: USGS AND NEVADA DEPARTMENT OF CONSERVATION AND NATURAL RESOURCES, NEVADA HISTORICAL PRESS, CARSON CITY.

Reference (Deposit): RANSOME, F. L., 1909, NOTES ON SOME MINING DISTRICTS IN HUMBOLDT COUNTY, NEVADA: USGS BULL 414, P. 19-25.

Reference (Deposit): VANDERBURG, W. O., 1936, RECONNAISSANCE OF MINING DISTRICTS IN PERSHING COUNTY, NEVADA: USBM IC 6902, P. 37-39.

Reference (Deposit): LINCOLN, F. C., 1923, MINING DISTRICTS AND MINERAL RESOURCES OF NEVADA: NEVADA NEWSLETTER PUBLISHING CO., RENO.

Reference (Deposit): COUCH, B. F., AND CARPENTER, J. A., 1943, NEVADA'S MAL AND MINERAL PRODUCTION (1859-1940, INCLUSIVE): NBMG BULL. 38, NO. 4, P. 130-131.

Reference (Deposit): STAGER, H.K., AND TINGLEY, J.V., 1988, TUNGSTEN DEPOSITS IN NEVADA: NBMG BUL 105, P. 192.

Reference (Deposit): SILBERMAN, M. L., JOHNSON, M. G., KOSKI, R. A., AND ROBERTS, R. J., 1973, K-AR AGES OF MINERAL DEPOSITS AT WONDER, SEVEN TROUGHS, IMLAY, TEN MILE AND ADELAIDE MINING DISTRICTS IN CENTRAL NEVADA: ISOCHRON/WEST, NO. 8, P. 31-35.

Reference (Production): COUCH AND CARPENTER (1943).

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Nevada Gold

Nevada has a total of 368 distinct gold districts. Of the of those, just 36 are major producers with production and/or reserves of over 1,000,000 ounces, 49 have production and/or reserves of over 100,000 ounces, with the rest having less than 100,000 ounces. Read more: Gold Districts of Nevada.