90

the serpentine in bunches of irregular form or in grains scattered through the
serpentine body with no apparent connexion with later intrusions or fissure
veins. The relation of the chromite to the rock is that of an original min-
eral, therefore, and not of a later accession.

MINING DEVELOPMENT.

A number of claims have been staked. The Iron King and Iron Queen - :
are owned by Stewart Calvert Company, of Oroville, Washington. On ~~
these two claims there is an open-cut (Figure 14, locality 1) and, east of
Chrome creek, outcrops of serpentine. Claims owned by Mr. Bryson of
Pavilion and leased by Stewart Calvert Company, lie west of the above-
mentioned two claims. Workings on these leased claims include a tunnel
46 feet long (Figure 14, locality 2), and four prospect pits (Figure 14,
localities 3, 4, 5, and 6). At the end of. July, 1918, the total amount of
excavation represented by the four prospect pits or open-cuts amounted to
about 700 cubic yards, and about 75 yards had been taken from the tunnel.
There had also been prospecting work in other places. At the date men-
tioned, about 200 tons of ore averaging about 40 per cent of chromic oxide
and 40 or 50 tons of lower grade, had been produced, and there were a few
hundred tons in sight. Later on another 100 tons was excavated, mostly
from the westerly opening (Figure 14, locality 6).- No ore had been shipped
up to the summer of 1919, but a wagon road had been constructed to con-
nect the property with the Ashcroft-Clinton road. Mr. E. Calvert of the
Stewart Calvert Company supplies the following assay results of the
chrome ore: average assay from open-cut No. 1 and an open-cut on cliff
top just south of No. 1 oa the Iron King claim, 42-6 per cent Cr.03; average
ofore from near tunnel and from open-cuts Nos. 5 and 6, 36-5 per cent
Cr.O3. Float on the Iron Queen claim, across the creek from the tunnel,
41-2 per cent Cr.Qs. 2

Ore-bodies.

The ore occurs in nodules, lenses, and tabular sheets, some of them with -
quite definite borders, and is also disseminated through the serpentine. .
Areas of disseminated ore are not necessarily connected with a core of rich
ore. The ore lies in either dense black or yellow-green, altered serpentine
with no apparent relation to any determinable structure. The trend of
two of the ore-bodies seems to have been northeast by east; one trends:
east. Faults trending east of north have offset the ore in at least two
places. The ore-bodies vary in size and all those so far uncovered have
been small. At open-cut No. 1, a rich ore-body 15 feet long, 8 to 10 feet
wide, and about 8 inches in thickness was uncovered. The open-cut No.
3, about 80 feet long with an average depth of about 5 feet, followed a
small ore-body for most of the length. About 150 tons of ore were exca-
vated. The ore pinched and swelled, its thickness being measurable in —
inches more often than in feet. About 100 tons of ore were taken from the
most westerly opening, No. 6.

Ore Available.

The chrome ore is an essential part of the rock mass in which it occurs.
Because of the isolation of the serpentine from outcrops of other rocks the
structure, shape, and size of the serpentine mass could not be determined