138

It crosscuts the mineralized zone which on the west side is bounded by
a broad dyke dipping steeply to the west. A long, lower adit at an eleva-
tion of 2,062 feet has been driven west to and through the dyke but did
not encounter the mineral zone. The zone may have a lower dip than
the dyke and if so and if it continues in depth, it would pass beyond the
face of the lower adit. Ore in mineral zones of this type, however, is
usually in lenses of varying size and it is possible that the mineral body
cut in the upper adit is a lens and does not continue as deep as the lower
adit.
Prosperity and Porter Idaho Mines (Localities 94 and 95)

References: Annual Report of the Minister of Mines, British Columbia, 1921, 1922, 1923,
1924, 1925, 1926, 1927, 1928, 1929, 1930, and 1931; Geol. Surv., Canada, Memoir
159.

The Prosperity and Porter Idaho mines are about 4,500 feet above

True North

No.3 Vein

O
yh?

Scale of Feet
(6) 200

400

Geological Survey, Canada.
Figure 13. Plan showing known veins and faults on Prosperity and Porter Idaho groups,

sea-level on the east slope of the mountain between Portland canal and
Kate Ryan creek (drains to Marmot river). 'The Prosperity adjoins and