Production of "rock" and "mineral" and average yield in silver and copper in Keweenaw County in 1912 and 1913.

From this table it is seen that in 1913 there was a decrease in the quantity of "rock" treated, and an increase in the quantity of copper recovered per ton of "rock."

Ahmeek. The Ahmeek mine, lying north and east of the Allouez, is located on the Kearsarge lode. The lode is opened by four shafts. No. 1 has a depth of 2,506 feet; No. 2, a depth of 2,693 feet; No. 3, 2,144 feet; and No. 4, 2,158 feet. The principal openings during the year were at shafts Nos. 1 and 2, where the ground developed was of about average grade.

During the year construction of the 4-stamp addition to the mill was in progress. A total of 383,749 tons of "rock" was stamped, yielding 13,742,141 pounds of "mineral," and 9,220,874 pounds of refined copper, or 24.0 pounds of refined copper per ton of "rock." The total cost per pound of refined copper was 13.30 cents.

Allouez. The Allouez mine is north of the North Kearsarge, and, as in recent years, operations were confined to the Kearsarge lode. As this lode does not outcrop on Allouez property, the shafts were started in the hanging wall at a steep angle and flattened to the dip of the copper-bearing bed just before reaching it. This plan avoids the expense of long crosscuts necessitated by vertical shafts.

At the close of the year No. 1 shaft had a depth of 3,499 feet, and No. 2 shaft had a depth of 3,407 feet. A total of 4,399 feet of openings at the two shafts developed ground of average grade.

A total of 236,663 tons of "rock" was stamped during the year, yielding 6,640,000 pounds of "mineral," or 4,091,129 pounds of refined copper, an average of 17.29 pounds of refined copper per ton of "rock." The total cost per pound of refined copper was 12.09

cents.

Mohawk.-The Mohawk mine, lying east of the Ahmeek, carries the outcrop of the Kearsarge lode for more than a mile and also contains several cross fissures carrying arsenides of copper, which have been mined to a considerable extent in the past. Operations were conducted through five shafts.

A total of 366,458 tons of "rock" was stamped, yielding 8,018,000 pounds of "mineral," or 5,778,235 pounds of copper. The total cost per pound of refined copper was 13.22 cents.

There were several companies doing development work during the first half of the year, but this was discontinued for the most part at the time of the strike.

63057°-M R 1913-VOL 1- -8

ONTONAGON COUNTY.

In 1913 Ontonagon County produced 3,634,187 pounds, or 2.7 per cent of the copper produced in the Lake district. Ontonagon County contains the southwestern portion of the copper belt. This portion has not been so thoroughly developed as the others, and consequently the geology is less understood than in the more northern counties. So far as developed the lodes are more bunchy than to the north and have produced a relatively high percentage of mass copper. The production of 1913 was derived wholly from amygdaloid rock.

The following table shows the production of the county in 1912 and 1913:

Production of "rock" and "mineral" and average yield in silver and copper in Ontonagon County in 1912 and 1913.

The production for 1913 shows a slight decrease from that of 1912. The developments in the county for the last few years have been very encouraging, and it will probably show an increase in production in the future.

Mass.-The Mass mine, adjoining the Adventure on the southwest, carries six known copper-bearing amygdaloid lodes, the Knowlton, the Mass, the North Butler, the Butler, the Ogima, and the Evergreen. In addition, the position of the property makes it probable that the newly discovered lodes in this part of the district may be present in the Mass ground. The main developments for the year were from "B" and "C" shafts on the Butler and Evergreen lodes, and continued to show as satisfactory conditions with respect to copper values as in previous years.

A total of 78,250 tons of "rock" was stamped, yielding 1,773,810 pounds of "mineral" and 1,213,545 pounds of refined copper, an average of 15.51 pounds of refined copper per ton of "rock" stamped.

Victoria.-The Victoria is the most southwesterly of the Lake mines that have made important production. The first attempts at copper mining in the district are said to have been made at this locality, though its recent period of productiveness began in 1906. The present production is from the Forest lode.

A total of 52,435 feet of opening was accomplished in the mine during the year, mainly from No. 2 shaft. "Rock" amounting to 137,163 tons was stamped, yielding 2,273,890 pounds of "mineral” and 1,428,693 pounds of refined copper.

The Lake mine was a producer during the year, and development was carried on by other companies, especially during the first half of the year or until the miners' strike.

MISSOURI.

By J. P. DUNLOP.

PRODUCTION.

VALUE.

The value of the mine output of silver, copper, lead, and zinc in Missouri in 1913 was $29,604,890, compared with $34,914,761 in 1912. The value of the copper production showed an increase and the value of the lead decreased only about $430,000, so that the large decrease in the value in 1913 was caused mainly by the smaller output and much lower average price of spelter compared with 1912. The recoverable lead content of Missouri lead concentrates sold in 1913 was equal to 40 per cent of the smelter production of primary lead in the United States derived from domestic ores, and the recoverable spelter content from Missouri zinc concentrates sold in 1913 was 37 per cent of the primary spelter produced by smelters from domestic ores in 1913.

SILVER AND COPPER.

The following table shows the production of silver and copper in Missouri in the years 1910 to 1913, inclusive:

1910.

1911. 1912.

1913.

Mine production of silver and copper in Missouri, 1910–1913.

For several years prior to 1913 the entire silver production has been derived from refining lead concentrates, but in 1913 a small quantity of silver was obtained from oxidized copper ore shipped by the Cornwall mine of St. Genevieve County.

The quantities given in the fourth column of the foregoing table are those of recovered silver. The silver content of the lead ores is so small that it is disregarded in the assay and sale of the concentrates. For this reason the smelter reports must be relied upon for the silver production. As may be seen by inspection of the table, the quantity of silver produced in any year bears no direct ratio to the quantity of lead concentrates smelted during that year. The reason for this is that the silver content is so small in quantity that the silver bullion is stored and refined in batches. If a series of years be taken into account, the concentrates are seen to average about 1 ounce of silver to the ton. The value is estimated at the average New York price according to the United States Mint.

COPPER.

The production of copper in Missouri in 1913 was 576,204 pounds, valued at $89,312, as compared with 440,725 pounds, valued at $72,719, in 1912. The mines of the North American Lead Co., which produced some copper, as well as nickel and cobalt in the years 1908 and 1909, were idle during 1913. The copper output for 1910, 1911, and 1912 was derived from concentrates recovered in dressing lead ore mined in St. Francois County, in southeastern Missouri. In 1913 there was an increased yield of copper from lead concentrates and in addition a considerable quantity of copper was recovered from copper ore shipped by the Cornwall Copper Mining & Smelting Co.

LEAD AND ZINC.

The production of lead and zinc in Missouri in 1913 is shown in the following table:

Mine production of lead and zinc in Missouri in 1913, by districts, in short tons.

Mine production of lead and zinc in Missouri in 1913, by districts, in short tons a-Conta

a In calculating the metal content of the ores from assays, allowance has been made for smelting losses in the case of zinc, but not in the case of lead. In comparing the values of ore and metal it should be borne in mind that the value given for the ore is that actually received by the producer, while the value of the metal is calculated from the average daily quotations at New York and St. Louis.

The total value of the recoverable metallic content of the lead and zinc concentrates produced in Missouri in 1913 was $29,494,064, a decrease of $5,286,184 from that of 1912. The production of lead concentrates in Missouri in 1913 (of which all but 323 tons were galena) was 255,723 short tons, valued at $11,444,935, as compared with an output of 256,838 tons, valued at $11,948,358, in 1912, a decrease of 1,115 tons in quantity and of $503,423 in value. Of this 1913 production of lead concentrates 219,511 tons, valued at $9,580,893, was derived from southeastern and central Missouri, an increase of 708 tons in quantity and a decrease of $268,961 in value. The average metal content of the lead concentrates from these districts was 67.2, as compared with 67.1 in 1912, and the value per ton in 1913 was $43.63, a decrease of $1.38. The quantity of recoverable lead in southeastern and central Missouri concentrates in 1913 amounted to 147,558 tons, a decrease of 645 tons. The output was equal to nearly 34 per cent of the primary lead smelted or refined from domestic ores in the United States in 1913.

Shipments of lead concentrates from southwestern Missouri were 36,302 tons, valued at $1,864,042, as compared with 38,035 tons, valued at $2,098,504, in 1912. The lead carbonate concentrates amounted to only 323 tons, valued at $10,548, a decrease of 38 tons. The quantity of recoverable lead from southwestern Missouri, or the