MINES BETWEEN ALTMAN AND GOLDFIELD. 
405 
VEIN SYSTEMS. 
Two definite systems of fissures occur in the mine. One strikes N. 20°-25° W. 
and has varying nearly vertical dips. The other has a course about N. 75°-80° E. 
and dips to the south at a high angle. The north-northwest system is represented 
by a number of veins of varying persistency and importance, while the east-west 
system consists of one well-defined vein. This vein, which lies about 60 feet north 
of the shaft on level 1, is about 3 feet wide and nearly vertical. It consists of a 
number of parallel fractures in dense, partially oxidized and silicified breccia. One 
hundred feet northwest of the shaft it cuts one of the principal veins of the north- 
northwest system, and on level 1 appears to fault it, the northern part being thrown 
about 10 feet to the west. There is no evidence of faulting at the corresponding 
points on levels 2 and 3. The veins of the north-northwest system are in general of 
similar character, but vein brecciation has often occurred, oxidation is frequently 
greater, and fluorite is a common vein mineral. 
The east-west vein has been stoped from the surface down to 40 feet below level 
1, about 250 feet long, the values occurring in the seams and fissures as tellurides 
and as rusty gold derived from them by oxidation. The screenings, which amounted 
to about one-third of the total vein matter, ran $60 per ton. At the point where 
this vein faults the north-northwest vein a stope 20 by 20 feet has been made in ore 
that is said to have been of very good grade. How far above and below the level 
this rich part extended was not ascertained. On the east side of the north-north- 
west vein the stope on the east vein is being continued down to level 2. On the 
west side it has gone down at least a considerable distance below level 3. 
The north-northwest vein, which is faulted by the east-west vein, is similar to 
the latter except that it is a little more oxidized. It passes about 40 feet west of the 
shaft on level 1 and is approximately vertical. Small bunches of ore have been 
taken from it just west of the shaft and 70 feet south of the shaft. This may be the 
same vein which is being worked 150 feet south of the shaft on level 3. The latter 
vein, which is 2 feet wide and dips steeply to the east, is much brecciated, and the 
oxidized fragments are held by a filling of purple fluorite. Screenings carrying 
20 ounces to the ton make up about one-fifth of the total ore; they contain rust}' 
gold, with occasional tellurides. A mineral which is probably tetrahedrite is some¬ 
times found with the telluride. 
A vein of the north-northwest system dipping steeply to the west is reached 
about 250 feet north of the shaft on level 1. It has been stoped extensively, but is 
not encountered again on other levels. 
Two other veins of this system have been drifted on for a short distance 200 
feet northwest of the shaft on level 3. One is practically vertical; the other, 30 
feet to the west, dips at a high angle to the east. A few small bunches of ore have 
been taken from these veins. Much ore is also said to have been extracted from a 
flat vein near the surface. 
On the whole the occurrence of the ore seems to be connected with the inter¬ 
section of the two vein systems. 
