Table I.—Relation of Gold and Silver Assays to Mineral Content of Veins.

Location. | Pyrite. | Galena. | Sphalerite. Gold. | Silver.
Group 1. Per Cent. | Per Cent. | Per Cent. | Oz. per Ton. | Oz. per Ton.
Burns Mountain, long crosscut.............ccceceseeeceeeeeceeeeeeeees E550) pt i | inane: Sr | sone 0.66 | Nil
Burns Mountain, long crosscut..............:cecccsseeeceeeeeeeeeeeeess 100 SD ak 2 | he ee 4.00 Nil
Burns Mountain, long crosscut, pyritized wall-rock.... aI OXO rae oll Praca pease ieee” | ecamen camr 0.08 | Nil
BurnseVountaineheldia dives. se a ee 90 cm nbirageramnens 5 ts Mae a 1.06 | Nil
Burns Mountain, Perkins vein dump..............cc.scc000-000-+- 50 | Sree eer beg wld aie abe 2.86 | 1.6
Group 2. |
IRATE TANG lA UNO Tortie O Ne ees ea tee 35 mPa: Bill imatecitiesy ol Nil Nil
Bridge Island Golds, Ltd., vein material from dump... SO ge eal PREP ETS VRP). oa eee ee Trace Nil
Nelson Creek quartz float. ........--...2:cccs:cccecececececeececeecceeeeese Q0ie We alps pitta See gies Nil Nil
West fork of Last Chance Creek, float...........0....2--ccccc0e- 2 Darian neuter | oesec5 Trace Trace
Group 8. |
ANTONE (NT OLUN D) 5 SUUUEEE LEY COWIE eee oe eee el|  eecceke £355. ae here £3 | 0.01 82.9
IRainere IL yokes, far keiate) Wb Mgee  ee  e Solid | ees Trace 31.6
Hoste med ces ann cc ib eens ae eee ee ease ee * * | 50 0.07 0.7
Hostensed sen aimea cites eer es eee Uae nu nes FNC) Aen te Nese NS 8 > ee ee on 0.06 | 0.4
Foster Ledge, main adit...........c22.c.cccccceccecceeeeeeeceecccceeceeeese + 8 Pesto! 0.02 | 1.0
Mostensaedeenmain adits sce tok ee 5 Ee eae ee ees 6 0.01 Nil
Group 4. |
Grub Gulchvealena pebble Hatt OOF mn | cs, | SOME cs 8.05 32.5
GrubiGulchwcalenanpebblemass st tuk es wee ees O Oise Ba |Peae eee 0.73 113.4
GrubiGulehy calenal pebbles... mesa sane See | | 80: 2ry yeas Hiraceasas 8.0

* Less than 5 per cent. + Small amount.

The assays in Group 1 of Table I, of samples taken from veins on Burns Mountain,
show the association of high gold values with pyrite, even though no gold is visible.
There is no direct relation between the gold content and the amount of pyrite. It is
significant that coarse pyrite, in cubes half an inch square from the wall-rock, contains
a small gold content. Although experience in Island Mountain and Cariboo Quartz
mines supports the belief that high gold values are associated with fine-grained pyrite
rather than coarse, no evidence of this relationship in the Stanley area was observed.

The assays in Group 2 of Table I, from samples of quartz well mineralized with
pyrite, indicate that some pyrite is completely barren of gold. Though these samples
were from “B” veins, they were not from veins of the north-north-easterly trending
group.

The assays in Group 3 of Table I indicate that veins with high galena or sphalerite
and little or no pyrite contain very low gold values, but may contain moderate amounts
of silver that is associated with the galena.

However, the assays in Group 4 of Table I, from clean galena pebbles from the
Grub Gulch hydraulic pit, show that even almost pure galena may contain high gold
values. These pebbles were smooth and well rounded and were specially selected to
avoid accidental salting with placer gold. No visible gold was present. Galena speci-
mens from other parts of the Cariboo have been seen containing wires and thin leaves

of gold.
FINENESS OF LODE GOLD.

During the course of work, samples containing gold were collected in order to
determine the true fineness of the lode gold. Three specimens containing visible gold
were collected on Burns Mountain—-one from the dump on the shallow workings on the
main Perkins vein, two others from piles of quartz near the cabin that presumably came
from the Perkins veins. One specimen was obtained from surface cuts on the Acme
group north of Stanley. No visible gold was seen in the vein exposed underground in
the Reid adit, and the sample taken there is of picked pieces of clean pyrite, containing
no visible gold, from the vein. Because bad air, starting about 700 feet in from the
portal, makes the long crosscut of Burns Mountain Gold Quartz Mining Company on

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