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256 THE DISTRIBUTION OF GOLD. IN SLUICES.
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The
total yield of the undercurrents and tail sluices, for the period
mentioned, was $7,872, while that of the claim was $145,000.
The
amalgam from the main sluice is worth from $7 50 to $8 50 per ounce
Troy, whereas that of the undercurrents varies from $6 to $6 20 per
ounce Troy.
The result of the undercurrents and tail-sluice cleanups for the year 1876-7 was as follows:
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This
amount (3,170 ounces) equals in value about 7 per cent, of the total
yield of the mine for the fiscal year, during which period 595,500
miner's inches of water have been used, extracting $291,116 90 gold.
Comparing
these final results with those of the previous year, 1875-6, the metal
is found distributed throughout the sluices and undercurrents in the
same relative proportions.
This
fact is noteworthy, since in 1875-6 the bulk of the material moved was
"top gravel," while in 1876-7 a much larger proportion of " cement
gravel" was run through the sluices.
In the heavy cement at French Corral and Manzanita
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