130

varies from 1 to more than 20 feet. The fault between the middle and upper
limestone block is also mineralized and this indicates that the fault is
probably pre-mineral.

The rusty mineral zones contain sphalerite and minor amounts of
pyrite, galena, and chalcopyrite. The boundaries of the mineralized areas
are quite indefinite. The sizes of the mineral bodies are unknown. The
deposits may be replacements along limestone beds or along shear zones. A
bed dipping down hill would have a broad outcrop in some places and a
narrow outcrop in others. The variable width of the deposits suggests that
they are replaced beds rather than replaced shear zones.

Mayflower Group (Locality 70)

References: Annual Report of the Minister of Mines, British Columbia, 1918, 1922,
1925, 1928, and 1930; Geol. Surv., Canada, Memoir 159.

The Mayflower group is 1,000 feet above sea-level east of Bear river
between Glacier and Bitter creeks and adjoins and lies east of the Tyee
group. The country rocks are tuffaceous sediments and tuffs of the lower
part of the voleanic member of the Hazelton group. The stock of grano-
diorite on which the Tyee is located outcrops just below the Mayflower
claims.

s
q
9

2
v
5
s

— Mineral veir

1cal Survey, Canada

Figure 11. Plan showing vein system on Mayflower group.

The workings consist of several open-cuts and three short adits. A
shear zone, 2 feet or less wide, extends up hill in an easterly direction for
300 feet along the bottom of a small creek. The zone contains a quartz
vein very sparsely mineralized with sulphide. Several quartz veins, indi-
vidually a little wider than the one in the shear zone, join it and adits
have been driven along these branch veins. Two of the branch veins are 1
to 3 feet wide and are well mineralized with pyrite, galena, sphalerite, and
chalcopyrite.