52 CONTRIBUTIONS TO ECONOMIC GEOLOGY, 1902. [bull. 213. 
On Discovery Claim, at the edge of Baker Flats and at the lower 
end of the productive part of the creek, a prospect hole 40 feet deep 
failed to reach bed rock. In all the claims above Discovery bed rock 
can be reached at a depth of from 5 to 20 feet. The bed rock is a 
schist, usually called slate by the miners. It ranges in color from 
dark blue to gray, and is often graphitic. It represents a rather 
argillaceous sediment which has been subjected to only a moderate 
degree of metamorphism, sufficient to produce many metamorphic 
minerals, but not to entirely destroy the original structure. This bed 
rock is often cut by stringers of quartz, which are reported to strike 
nearly east and west. These stringers are white and at the outcrop 
are decomposed along with the remainder of the bed rock, which is 
often so disintegrated that it can be shoveled out like fine gravel. 
The width of the pay streak varies from 20 to 60 feet. In one place 
a pay streak 7 feet thick is reported. On the lower claims the pay 
streak is near the surface, so that summer work "by stripping and 
shoveling" is possible. In the Tipper claims the pay streak is found 
below several feet of muck and barren gravel, and is mined with steam 
thawers in winter and washed in the spring. Early in August, when 
the creek was examined, only one claim, known as Claim No. 2, was 
working. The others were shut down because the dumps had already 
been sluiced. On Claim No. 2 miners were shoveling into the sluice 
boxes directly from the pay streak. It was impossible to see the bed 
rock in place, or to see a full section of the gravel from the surface 
down in the deeper workings. The pay gravel consists of angular 
fragments of schisl and a small amount of vein quartz, with occasional 
rounded bowlders of a basic, igneous rock. The gold is not evenly 
distributed in the pay streak. Sometimes the best pay is found on 
the surface of a layer of decomposed bed rock. " Stringers" of gold 
on this bed rock were found carrying $10 to $35 to the pan. These 
"stringers" are lines of gold parallel with the bed rock, which look 
when uncovered as if the rock had been sprinkled with gold. On 
some of the claims values are reported to have been found to a depth 
of 2^ feet in a hard, blocky bed rock. On some of the lower claims 
above the bed rock there is a waxy clay, called by the miners "gumbo," 
which is probably decomposed rock in situ. This clay ordinarily does 
not carry gold, but on one of the upper claims a gumbo ball is reported 
to have carried $1 in fine colors. 
In the summer of 1901, after the discovery, a small amount of gold 
was taken out before the end of the season. During the winter of 
1901-2 a large part of the pay streak was taken out by drifting, and 
the dumps were washed in the following spring. It was estimated by 
a representative of the Eagle Mining Company, which owns several of 
the claims, that the creek had produced approximately $150,000 prior 
to the 1st of August, 1902. 
Gold Run occupies a very slight depression parallel with Glenn 
