MINES BETWEEN ALTMAN AND GOLDFIELD. 
417 
and trends almost due north. The syenite is here 100 feet wide, as shown by the 
south crosscut. At the La Bella vein on level 8 a little syenite is exposed, and 
likewise on levels 8 and 12 along the western boundary line of the property, in both 
cases with fairly sharp contacts, but neither of these bodies appears to connect with 
that at the shaft. It would thus seem as if the latite-phonolite contained several 
intrusive masses of syenite which have a very irregular shape. 
There are very few phonolite dikes. One was noted on level 8 along No. 3 
vein, 350 feet northwest of the main shaft. Two basic dikes have been opened by 
the workings, both trending north-northwest and dipping very steeply west-south- 
west. One of these, which is more closely defined as a monchiquite, is reached by 
a crosscut northeast from the shaft on level 10 and* lies in unproductive territory. 
The other lies about 200 feet west of No. 2 shaft, and is exposed on levels 11, 12, 
and 13, as well as on level 7 of No. 2 shaft. In the latter place it flattens some¬ 
what and changes its strike. 
VEIN SYSTEMS. 
The trend of the main fissure near the surface is S. 60° E. from shaft No. 2 to 
the main shaft and to the Lillie shaft, a short distance east of which it seems to die 
out. The workings disclose, however, the same tendency as in the Hull City mine 
to throw out branches on both sides of the main fissure. The detailed structure in 
the Vindicator is very complicated, and there is considerable uncertainty as to the 
correct connection of the veins between the various levels, an uncertainty which 
can often be settled only by actual stoping operations. The difficulty is increased 
by the very tight character of the veins and the general absence of well-defined 
walls. 
At No. 2 shaft the principal vein is called the Wallace. Below level 5 this 
vein soon separates from that trending toward the Lillie shaft. It assumes a direc¬ 
tion of N. 30° W. and a dip of 80°, and has been followed for 400 feet south-south¬ 
east of the shaft down to level 13. In the southward widening angle between the 
Wallace and the Main or No. 1 vein lie several other veins of less importance, as 
shown on fig. 55. No. 1 vein is practically continuous to the Lillie shaft by the 
main shaft and gradually straightens up, so that at the Vindicator shaft it is almost 
vertical. 
No. 2 vein branches from No. 1 a little east of the Lillie shaft, and at the Vin¬ 
dicator shaft on level 8 lies 100 feet southwest of No. 1. A small and rich branch, 
the Vindicator, here lies between No. 1 and No. 2. It then seems to cross No. 1 
vein, 200 feet northwest of the main shaft, and continues diverging with a strike of 
N. 30° W. up to the boundary line of the property. It is possible, however, that 
there is no real crossing, but that No. 2 vein north of the shaft is simply a diverg¬ 
ing branch like the Lillie No. 2 vein on the south side of the same shaft. No. 3 
vein branches from No. 2 and lies a short distance east of it. These two veins, 
also known as the Campbell and Wood veins, are not definitely known above level 8. 
On level 16 No. 1 vein can not be definitely recognized, and the whole vein system 
seems to be materially different. 
In the southern part of the property lie the La Bella vein, known from the 
Christmas and Golden Cycle mines, and the Sigel and New veins, also opened in 
