Custer weekly chronicle. [volume] (Custer City, S.D.) 1890-1931, 1894-01-13

not TO contain any gold save that con
talned In the sulphurets. The failing
concentrated well on the Frue yanner
all the sulphurets in the ore being readi
| iy separated. The concentration was q
the rate Of from l6 to to "a to tn,
concentrates still confined nearly "
per cent quartz and 9angue, but tests
showed that by re-concentrating on
true Vanner these concentrates could
be cleaned without difficulty, giyinf
product sufficiently high grade TO be
salable. (As soon as certain necessary
repairs can be made in the mil these
concentrates will be re-run and carefully
cleaned and further supplemental re.
port made of the result
Sample No. l-Clean white uuartz
from open cut on the north and south
vein on the North Star" claim near
Custer City, South Dakota:
Weight Of orc 1000 pounds.
Fine gold from plates and battery 0.3J
grams
Value Of gold. 80 %.
Very little sulphurets contained in the
ore so that concentrates were discarded.
Result
Average value Of the ore by fire assay per
AVERAGE value Of the iaiIngs by ire assay O'-
Extraction-Y of gold n battery, 90 90
sample No. 2.-White quartz with sui.
phurets from the Gold Hill mine near
Custer City, So1th Dakota:
Weight of ore, 1000 pounds.
weight OF concentrates. 27S pounds.
Concentration at the rate of IA % TO |
Assay value Of concentrates, So 20 per
tor.
Gross value of gold in concentrates.
s0.S4.
Yield Of concentrates per ton of orig
inal ore, s042.
Fine gold from battery and plates, 762
grams.
Valne Of gold, s. G6.
Yield of free gold per ton Of ore, s2.53
Average value Of ore. samples taken by
cobhlng, per ton, 1000 pounds. s33l
Average value OF ore, sample taken from
battery feed per ton, 2.OOO pounds 400
Average value cf tailiags from Vanner.
per ton 1000 pounds. Os3
ExttactonLHield from concentrates per
-, ton original ore. ................i... O42
Yield Of free gold per ton original ore 2.53
Total yield free gold per ton original ore 2.s5
sample No. 3.-White quartz with sui
phurets from two openings on the North
star mine near Custer City, South Da-
kota:
Weight Of ore from opening No. 2,
1000 pounds.
Weight of ore from opening No. l,
1000 pounds.
Weight Of concentrates from No. land
No ], l69 pounds.
Rate Of concentration % % to1.
Assay value Of concentrates gold SS.6s
per ton.
Gross value Of gold in concentrates
S0.59 per ton.
Yield of concentrates per ton Of orig
inal ore S029.
Fine gold from battery and plates
. A grammes.
Value Of gold from battery and plates
s1.63.
Yield of free gold per ton of ore $50
Results
Average value Of ore No. 2, sample from
cObbing, per ton. 2,OOO pounds ...... SIg5
Average value Of ore No. 2, sample from
battery feed per ton, 1000 pounds. Las
Average value OF ore No. l. sample by
cohbing, per ton 1000 pounds. 2O7
Average value Of ore No. l. sample from
battery feed per ton 1000 pounds. i9s
Average value OF tailings from Nanner,
ore No. 2, per ton 1000. .............' O73
Average value Ot tailiugs from Nanner,
r1n 1.cssf fsorriefs. u.Zs
Yield of Tree gold per ton original ORE. Os2
Total yield per ton original Ore.......... Ill
Sample No. 4-White quartz with sui
phurets from the Strasburg mine, near
Custer, South Dakota, weight of ore,
4 900 pounds.
Weight Of concentrates, l9l pounds.
Rate of concentration q to |.
Assay value of concentrates gold per
ton, S4.S5.
Gross value gold in concentrates so 46.
Yield of concentrates per ton of orig
inal ore, 1928
Fine gold from battery and plates,
IL grammes.
Value of gold from battery and plates,
sl.l3.
Yield of free gold per ton of ore, S0.5s.
Result
Average value Of ore, sample by cobbing
per ton 1000. Observation-Disclosures. : 0S3
Average value of ore samples from bat
tere plates, e,00o pounds. ............. O5O
Average value OF tailiags from Vanner,
1000 pounds. NEUTRALITY-SUSPICIOUS.. O.25
Extraction Yield from concentrates
per ton original ore. Ore................... O23
Yield from free gold per ton original ore, 0.56
Total l..................... O79
Respectfully submitted,
W. L. JENNEY, +. NJ, PH. d.
Dean of Dakota School Of Mines.
Rapid City, South Dakota, Novem Der