Part of ore amalgamated, followed by cyanidation of slimes and sands-total ore and slimes cyanided, 484,407 tons. Also 1,564,695 tons of sands and slimes from ore amalgamated was cyanided.

6. CYANIDE AND QUICKSILVER CONSUMED IN THE EXTRACTION OF GOLD AND SILVER AT MILLS IN CERTAIN WESTERN STATES.

Potassium and sodium cyanides consumed at mills in certain Western States, 1911-1921.

Potassium and sodium cyanides consumed at mills in certain Western States, 1911-1921

Continued.

Sodium cyanide consumed at mills in certain Western States, 1916-1921, in pounds.1

1 The consumption of potassium cyanide was 185,764 pounds in 1916, 137,658 pounds in 1917, 625 pounds in 1918, 68,155 pounds in 1919 (17,884 pounds at mills in Arizona and 50,271 pounds at mills in Nevada), 7,825 pounds in 1920 (7,800 pounds at mills in Arizona and 25 pounds at mills in Washington), and 5,626 pounds in 1921 (Arizona, 4,200 pounds, Idaho, 600 pounds, and South Dakota, 826 pounds).

Sodium cyanide consumed at mills in certain Western States, 1916-1921, in pounds—

Includes some cyanamid (in 1921, 467,900 pounds of 48 per cent NaCn and 87,744 pounds of cyanamid). Quicksilver consumed at mills in certain Western States, 1911-1921.1

Quicksilver consumed at mills in certain Western States, 1911-1921—Continued.

PART III.

IMPORTS AND EXPORTS.

1. GOLD AND SILVER IMPORTS AND EXPORTS INTO AND FROM THE UNITED STATES.

Values of gold imports and exports and annual excess of exports or imports, 1874 to 1922.1 [Source: Bureau of Foreign and Domestic Commerce.]

1 The figures relate to coin and bullion only prior to 1895; subsequently they include ore also.

57,648, 139 63, 111, 073 75,904,397

51,097,360

25,344, 607 403,759, 753 685, 254, 801

94,977,065 667,356, 920 238, 294, 891

38,573, 591

51,399, 176 72, 432, 924

53, 648, 961 96, 221, 730 114, 510, 249

38,945, 063

148, 337, 321

91,531,818

118,563, 215

22,509, 653 57,328, 348 77,762, 622 112,038, 529 146, 224, 148 90,249,548 291, 921, 225 190,852, 224

36,874, 894