TUNGSTEN ORE IN EASTERN NEVADA. 
By F. B. Weeks. 
A hubnerite-bearing vein was discovered about 12 miles south of 
Osceola, Nev., in 1900. It occurs in the foothills on the west slope 
of the Snake Mountains, near the base of Wheeler Peak. The near- 
est railway point is Frisco, Utah, on the Oregon Short Line Railwaj 7- , 
about 100 miles distant. 
The country rock is a rather coarse porphyritic granite, composed 
of quartz, mica, and hornblende, and having a rudely bedded structure 
parallel to that of the overlying Cambrian quartzite, which dips 20° 
to 25° SSW. The vein cuts across this granite, striking N. 68° E. 
and dipping 05° NW. The main vein is normally about 3 feet wide, 
pinching in places to a few inches, but rapidly regaining its usual 
width. Several smaller veins, from a few inches to a foot in width, 
outcrop on the slopes and can be traced to the main vein, entering it 
at a sharply acute angle. The main vein was traced for a distance of 
2,100 feet by croppings and float from its outcrop near the base of the 
lowest foothill up the slope of the mountain. 
Sufficient development had not been made at the time of visit to 
determine the extent of ore deposition. The vein walls are well 
defined. Where the vein has its average thickness, it is formed of 
milky-white quartz, carrying a large amount of hubnerite. Where 
the vein pinches, the quartz is schistose, and the ore is in small 
stringers and small in amount. The ore occurs in solid masses, fre- 
quently attaining a thickness of G to 12 inches. It is also disseminated 
through the quartz in thick plate-like forms, and also occurs crys- 
tallized with the quartz crystals. Small shoots of ore penetrate the 
country rock for a few inches. The vein material is easily crushed, 
and the hubnerite, because of its weight, can be readily separated 
by jigging. 
At one locality on the vein there was a somewhat remarkable 
occurrence of the ore. It was found in large bunches or blocks aver- 
aging 75 per cent tungstic acid, and from a small space 4^ tons of ore 
were obtained. Scheelite has been found in small bunches and 
streaks with the hubnerite. 
More recent information regarding the development of this ore 
body may be found in a paper by Mr. Fred B. Smith in the Engineer- 
ing and Mining Journal, volume 7:>, pages 304-305, 1902. 
lit:; 
