MINES OF BATTLE MOUNTAIN, EAST GROUP. 
463 
which are distinct on level 3, join to form a single ore body, which for a length of 
over 200 feet has a width of 40 or 50 feet. The Emerson pay shoot attains its 
maximum length (about 600 feet) on level 5. A short distance below this level 
the lode, if it persists, enters the granite, and within this rock, so far as known, it 
carries no ore. On the northwest the pay shoot ends near the Portland line. On 
the southeast the pay shoot, as seen on level 5, continues for about 150 feet south¬ 
east of the crossing of the Drury lode. The Emerson sheeted zone, however, 
continues in the breccia beyond this point, but has not been followed to the granite- 
breccia contact. 
The Bobtail pay shoot reaches its greatest length (about 1,000 feet) just above 
level 2. This diminishes to about 450 feet on level 5. A short distance below 
this level the Bobtail, like the Emerson, meets the granite-breccia contact and 
the economic importance of the lode vanishes. On the northwest the pay shoot 
reaches the, Portland line only near level 2. On the southeast the ore extends 
up to the granite-breccia contact on level 3, but on all- other levels ends well within 
the breccia, though this fissure zone apparently continues to the contact and 
probably into the granite. 
The Grant, Drury, East, and London lodes are usually narrow sheeted zones 
in the breccia and are not known below level 5. They contain several important 
pay shoots, which, however, are not so persistent in depth and length as those of 
the Independence, Emerson, and Bobtail. The occurrence of their ore bodies 
could not be well studied at the time of visit, but they appear to be of the usual 
structural type—narrow zones of close sheeting, with the value chiefly in the form 
of calaverite in the fissures. 
With the exception of the upper 300 feet of the Independence lode and the 
contested portion of the Strong lode, the only important lode known in the granite 
of the Independence mine is the No. 6 lode. This has shown a fairly continuous body 
of ore from the granite-breccia contact above level 5 (fig. 62, p. 459) to level 6 
and isolated ore bodies between levels 6 and 9. The lode is a narrow sheeted 
zone in granite, in some places following a phonolite dike. The granite between 
the fissures is altered to a porous mass consisting chiefly of secondary feldspar, 
with nests of pyrite and calaverite partly filling the irregular cavities. The best 
ore occurs in a rather soft decomposed streak, usually from 3 to 8 inches in width, 
and is worth about $50 per ton. 
One of the most interesting ore bodies in the mine was that stoped from the 
Flat vein above and below level 3. This stope has a length from southeast to 
northwest of about 400 feet, and an extreme width of about 200 feet. The ore had 
an average thickness of 6 or 7 feet and dipped northwesterly at about 18°. It lay 
generally in the breccia, being bounded on the southwest by the granite, and passing 
somewhat irre°;ularlv into barren breccia in other directions. The ore occurred 
in a sheeted zone, which in some portions of the stope is divided into two zones 
by a slab of country rock. These zones of sheeting are not merely coextensive 
with the ore, but persist bejmnd the margin of the ore body into the granite and 
into the breccia. The Flat vein is crossed by the Independence lode and phonolite 
dike, and by a number of other fissures of general northwest strike. The ore was 
continuous with that of the Independence lode and extended for varying .distances. 
