THE MINERALS OF IDAHO 471 



the gold rush a German prospector uncovered a 2-foot vein of scheelite 

 in Pony Gulch. Because of the weight of the mineral he mistook 

 it for an ore of lead, but when an assay showed none of that metal he 

 abandoned the vein. During placer operations on Trail and Pony 

 Gulches scheelite was frequently found on the bed rock and in Eagle 

 and Tributary Gulches it is washed into sluice boxes. Dunlap and 

 Smith, while placer mining in Eagle Creek, uncovered a small vein 

 near the Columbus group. 



In the Golden Chest mine, of which Auerbach was manager, he 

 writes that the scheelite occurred in the Klondike shoot on the Katie 

 and Dora vein in white quartz which contains abundant pyrite and 

 less chalcopyrite and galena. The scheelite was found in a shoot 

 about 75 feet long and had been followed to a vertical depth of 350 

 feet. In one place there were 5 feet of excellent grade scheelite ore 

 with a maximum thickness of 3 feet of pure scheelite. In another 

 portion of the vein the concentrating ore carrying disseminated scheelite 

 was 15 feet wide. While the scheelite ore formed a well defined shoot 

 the bodies themselves were irregular pinching down to streaks, branch- 

 ing out into numerous veinlets and again uniting to form large solid 

 bodies. About 50 tons of scheelite had been removed from the mine 

 previous to 1908. Auerbach illustrates a number of excellent speci- 

 mens of the scheelite. Some masses weighed 100 pounds and con- 

 sisted of pure scheelite. 



During the war demand for tungsten from 1914 to 1918 consider- 

 able interest was aroused and the scheelite occurrences near Murray 

 were actively prospected and some production of tungsten ore made. 

 The Golden Chest mine was the principal producer. The Friday 

 group, formerly the Golden Winnie or Arrastre Smith property, 

 mined some scheelite which occurred mixed with pyrite in a flat, 

 greatly shattered and somewhat oxidized quartz vein. This prop- 

 erty is located at the south side of Prichard Creek about 2 miles below 

 Murray. 



The Mother lode on the south side of Ophir Gulch about 2,000 

 feet from its mouth on Prichard Creek almost opposite the Golden 

 Chest mine has opened gold veins of the same system as those of 

 the Golden Chest mine, but these contain no scheelite. Scheelite 

 occurs on the property in bunches associated with narrow seams of 

 quartz distributed through a dike of diabase or similar basic igneous 

 rock. 



In the Kennan property on Pony Gulch, a tributary to Beaver 

 Creek, scheelite occurs rather abundantly in quartz seams in a shat- 

 tered zone in quartzitic slate. Individual masses of the scheelite 

 reach 10 cm. or more in diameter. 87 



8" D. C. Livingston. Univ. of Idaho. Sen. of Mines, Bull. 2, pp. 15-21, 1919. 



