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stock-works of intersecting stringers and veins of milky,
comb, and sugary white quartz. They vary in width from a
fraction of an inch to 12 feet or more, most of them being
under 6 inches. Some are mineralized with sulphides and free
gold, and contain values in gold, silver, lead, and zinc.

The more important quartz veins have formed along
subsidiary shear and fault zones. On the basis of mineral
association they may be classified as; (a) tetrahedrite type;
(b) galena-sphalerite type; and (c) pyrite-galena type.

The veins of the tetrehedrite type consist of grey,
vitreous, and white sugary quartz sparingly mineralized with
tetrahedrite, chalcopyrite, and minor pyrite, malachite, azurite,
and native gold. Principal values are in gold and silver. Some
of the more promising prospects in the area, including the
Fairview and Farrell properties, are of this type. The most
persistent vein on the Fairview property averages 1.5 feet in
width over a length of about 200 feet, and is in carbonate rock.
A selected sample assayed 0.28 ounce of gold and 22.3 ounces of
silver a ton. The best vein on the Farrell property is in
sheared andesite, is 2 feet wide, and may be more than 100 feet
long. Picked samples have assayed 0.3 to 0.8 ounce of gold a
ton.

The sphalerite-galena deposits consist of quartz veins
and quartz-rich zones mineralized with patches of galena,
sphalexite, and minor pyrite, averaging half an inch or less
in diameter. A quartz zone on Manson River near-Discovery Bar
is le feet wide,..and occurs, in. sheared. andesite along is fon eaacan
fault. It consists of parallel stringers of quartz ¢ % inch
wide, separated from one another by +- to l-inch Ht te Nee wall-
rock. The sulphides are in the quartz stringers. A grab sample
assayed 1.58 per cent lead, 0.49 per cent zinc, and 1.52 ounces
of silver and 0.005 ounce of gold a ton. A 4-foot vein sparsely
mineralized with galena and pyrite occurs in carbonate rock near
this quartz zone. Several other minor occurrences were observed
elsewhere along the Manson fault zone.

The Berthold property affords the only example of the
pyrite-galena type of deposit. The deposit consists of a
silicified fracture zone, 10 feet wide, in argillaceous
quartzites near a probable branch of the Manson fault zone.

The fracture zone-is mineralized with fine-grained pyrite and
‘minor amounts of galena. Assays indicate 0.01 to 0.06 ounce
of gold and 6 to 13 ounces of silver a ton across 10 feet.

No. genetic relationship is apparent between the mineral
deposits of the Manson fault zone and any nearby volcanic or
intrusive rocks. The source of the ore-bearing solutions is
not known, but is possibly some deep-seated phase of the
Omineca or later Tertiary intrusions. The Manson fault zone
provided abundant channelways for mineralization, and
deposition occurred wherever conditions were favourable.
Carbonatization preceded mineralization in many places along
the fault zone.

Deposits Related to Shear or Fracture Zones Along

peneous Concacts. Several mineral deposits have been found
n the map-areé. localized along minor shear or fracture zones
in relatively brittle andesites and granitic rocks at or near
igneous contacts. These zones are unrelated to any regional

structure. The shear zones probably originated as a result of