Gold-Beari)ig Lodes in California. — Hershey. 89 
ity, and this has been a Mecca for prospectors ever since. A tun- 
nel driven northerly 700 feet into the land-slip presents evidence, in 
the pressing in of the lagging on the east side, that the material of 
the "slide" is settling toward the west or at a right angle to the 
slope of the mountain. 
The Golden Jubilee — A north-south belt in the grano-dioryte, ten or 
twenty feet in width, has been crushed through faulting, and into this 
broken material has been injected an irregularly branching, narrow 
dike of dioryte-porphyryte of the later system. The belt of crushed 
grano-dioryte contains auriferous pyrite disseminated through it, con- 
stituting it all "milling ore." Across a section of the belt, 18 feet 
wide, an averaged sample assayed $16 per ton. In certain ochre seams 
and bunches there is a concentration of the values to $1,000 and $2,000 
per ton. There is along the "ledge" more or less of white quartz, 
but it is of low grade. The "ledge" of crushed grano-dioryte is 
bounded by distinct walls which show recent movement, being pol- 
ished and striated. That movement is in progress at the present 
day is proven by a dislocation along one polished seam, amounting 
to about three-fourths of an inch in less than two years. 
The Dewey. — Along a north-south dike of dark green dioryte-por- 
phyryie in grano-dioryte, there has been faulting, crushing the rocks 
along a narrow belt and forming a fissure in which has been de- 
posited a I to 2i/2-foot vein of white, milky ribbon quartz carrying 
auriferous pyrite. On the "pay shoot," quartz and adjoining crushed 
grano-dioryte carry free gold to an average value of $8 or $10 per ton, 
but the concentrated pyrite assays up to $500 per ton. 
The Biinier mine. — This has a regular vein of white ribbon quartz in 
grano-dioryte (course northeasterly), but it is of such low grade as 
not to be milled. In the accompanying belt of crushed grano- 
dioryte, decomposed pyrite yields gold to the extent of $20 to $25 per 
ton of ore extracted. Narrow, vein-like dikes of greenish-gray dioryte- 
porphyryte occur in the mine-workings but do not accompany the 
quartz vein. 
The IVagner mitie. — Along a faulted belt in the grano-dioryte trend- 
ing northerly and southerly, there is a persistent seam of ochre which 
is auriferous to a high degree. There is also a vein of white ribbon 
quartz of lower grade. 
It is a feature common to all the mines in this district that 
the veins of quartz are very low-grade, while the main values 
are found in iron-stained belts of crushed grano-dioryte pro- 
duced by faulting and subsequent mineralization from waters 
ascending along these lines of weakness in the rock. The re- 
verse appears to be true in the similar districts of Grass Valley 
and Nevada City, in the Sierra Nevada region, where it is the 
white ribbon quartz that carries the gold, while the pyrite in 
