Granite Creek Mine, Potosi Mining District, Osgood Mountains, Humboldt County, Nevada, USAi

Regional Level Types
Granite Creek Mine	Mine
Potosi Mining District	Mining District
Osgood Mountains	Mountain Range
Humboldt County	County
Nevada	State
USA	Country

Secs. 29 & 30 T38N R42E. Tactite.
Structure: Folds, Faults

Alteration: Contact Metamorphism

Deposit: Scheelite is irregularly distributed and is entirely absent from much of the tactite. Where the contact is about parallel to the strike of the limestone, the tungsten mineralization is more nearly uniform throughout the whole mass of tactite. Where the contact is at an angle to the strike of sedimentary beds, the tactite bodies and the ore zones within them are more irregular and may pitch in the direction of the dip of -the beds. The largest and most continuous tactite orebody is a-t the eastern end of the property. The main layer has been traced for 230 ft on the surface where its width ranges from 5 to- 25 ft. On the lower adit level it is 200 ft long. The average- width is between 15 and 20 ft and the tungsten content is r- ather uniformly about 0.6 % wo3, which was diluted somewhat - in mining. Occurrence of scheelite was known for some time before ore was mined in 1942. Mainly underground workings, from 1942 to 1944 and from 1950 to 1955. The property is estimated to have about 42,200 tons ore at 0.45% wo3 reserves. Main production was from the main tactite body at the east end of the orebody. Workings consist of 2 adits connected to 2 glory holes; pits and trenches. ; info.src : 1 pub lit; 2 unpub rept

Deposit type: W skarn

Geology: Main tactite body lay in keel & lower part of trough-like structure, very variable in size and shape the contact is generally east-west with numerous irregularities. Irregular and discontinuous tactite bodies occur along the contact for over 2200 ft.

Rock formation(s): Osgood Mtns. Stock
Preble Formation;Preble Formation;Preble Formation;Preble Formation


Ore(s): Tactite At Limestone/Granodiorite Contact

Other Databases

Link to USGS MRDS:	10045079

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References