Gold- Bearing Lodes In California. — Hershey. 91 
which contain from $5 to $40 per ton in free gold. They trend 
obliquely away to the westward from the granite-porphyry dike men- 
tioned above, and the tenure of the ore decreases away from the fault 
— the main "lead" of the district. These veins do not mark the sites 
of any prominent faults, but all show decided vertical movement along 
their planes. 
The Nellie Frances. — Between the two great faults, on the south of 
Coffee creek, a north-south dike of granite-porphyry cuts a belt of 
serpentine. Faulting along the western wall of this dike has crushed 
the serpentine in a narrow belt and produced a gold-bearing gouge. 
I have no means of knowing the value of the ore, except that the 
owner has panned from it two cents to $2.00 per pan. 
The Dorlcska. — This rich mine is on a north-south vein of white 
quartz, i to 2^ feet in width, which occurs in the serpentine a short 
distance east of the large granite-porphyry dike in the Lawrence 
fault near the head of Union creek. ■ Along the vein there has been 
faulting and consequent shearing of the serpentine into schist. The 
gold is contained in all the crushed material. Ocherous bunches of 
irregular shape are said to carry platinum, in one place to the extent 
of 14 ounces per ton, but this I could not verify. The white quartz 
is very rich in gold, much of which is free, but more is contained in a 
combined sulphide of lead and telluride of gold, a mineral resembling 
fine-textured galena, and locally known as nagagite. During this sea- 
son, ore valued at $5,000 per ton has been sacked for shipment at this 
m.ine. 
On the Trinity-Siskiyou divide, just above the Dorieska mine, the 
300-foot dike of granite-porphyry in the Lawrence fault contains free 
gold disseminated through it, and from the schistose bolts on either 
side good "prospects" may be obtained with the pan. 
The Yellow Rose of Texas, — A dike of a peculiar variety of granite- 
porphyry containing needle-shaped crystals of black hornblende 
("bird's-foot porphyry") cuts the serpentine a few score yards east 
of the granite-porphyry dike in the Lawrence fault, with which it is 
parallel. Along its eastern wall, faulting has converted the massive 
serpentine into talcose and serpentine schists, and produced a fissure. 
subsequently filled with white quartz. The quartz is very rich in 
free gold, and even the schist band contains sufficient of it to make 
much of it a milling proposition. The B. V. mine is on this same 
lead, one-half mile farther north, and yields gold in quartz and schis- 
tose serpentine. 
The Great Western. — Faulting along and through a north-south 
dike of granite-porp4iyry in the serpentine east of the Lawrence fault, 
has produced alternating bands of talc schist and crushed porphyry 
all of which carry gold, especially certain narrow seams of clayey 
matter which represent the extreme of the crushing action. 
The Blue Lead-Iowa. — This rich mine it typical of those having 
much free gold in talc schists and gouges, while quartz is relatively 
unimportant and there is no persistent vein. Within the massive ser- 
