124 ALASKAN MINERAL RESOURCES IN 1904. [bull. 259. 
galena and arsenical pyrites, have been found in the region southwest 
of Cassiterite Creek. Ore from one of these is reported to yield an 
assay of 15 ounces of silver per ton. 
CAPE MOUNTAIN LODE. 
LOCATION AND GEOLOGIC RELATIONS. 
Cape Mountain is situated in the extreme western end of the penin- 
sula and takes its name from Cape Prince of Wales. It is essentially 
a granite boss surrounded by limestones and slates in which it is 
intruded. Investigations made during the past season show that the 
contact of limestone and granite is very irregular and that around the 
margins masses of limestone are often included in the granite, while 
the granite often penetrates the surrounding limestone in a fringe of 
porphyritic dikes. 
Float ore consisting of cassiterite in association with tourmaline and 
other minerals has been found at many places on the mountain, and 
systematic prospecting for tin-bearing ledges has been in progress for 
the past three seasons, but the development has been slower than at 
Lost River, mainly on account of a heavy mantle of talus and resid- 
uary soil, which makes it difficult to trace the float ore to its bed-rock 
source. In many prospect holes this covering goes to a depth of 6 or 
7 feet. During the summer of 1904 work was done at a number of 
places, only a few of which were seen by the writer. The most exten- 
sive workings were those of the Bartels Company. 
THE BARTELS COMPANY'S DEVELOPMENTS. 
This company staked many claims around the mountain in 1902 
and 1903, and began development work in 1903. The equipment of 
the company consists of a permanent camp (called Tin City) and cen- 
tral power station, from which wires run to electric drills at the pros- 
pecting tunnels. The bed rock in many of the prospect holes carries 
traces of tin, but ore of appreciable value has been found in place in 
only one of the tunnels. This tunnel, which is on the mountain one- 
half mile north of Tin City, is in the granite near its contact with the* 
limestone. The granite in the tunnel is intersected by joint planes that: 
run north and south, or about at right angles to the direction of the 
tunnel, and the tin ore is not evenly distributed through it, but seems 
to be arranged in ill-detined streaks that run parallel to the joints. 
Assays of picked samples from this tunnel have yielded as high as 40 
per cent of tin, but no average samples had been taken or assayed ati 
the time of the writer's visit, and the average rock from the dumr. 
will probably show T only traces of tin. About half a mile north o1 ! 
this tunnel a great deal of float ore of very high grade has been pickec j 
up on the surface of the ground, and considerable prospecting by opei ! 
