Clay County Historical Production Figures |
| Year | Surface | Underground | Total |
| 1829 | 0 | 5,000 | 5,000 |
| 1830 | 0 | 6,000 | 6,000 |
| 1831 | 0 | 7,000 | 7,000 |
| 1832 | 0 | 8,000 | 8,000 |
| 1833 | 0 | 9,000 | 9,000 |
| 1834 | 0 | 10,000 | 10,000 |
| 1835 | 0 | 9,000 | 9,000 |
| 1836 | 0 | 8,000 | 8,000 |
| 1837 | 0 | 7,000 | 7,000 |
| 1838 | 0 | 6,000 | 6,000 |
| 1839 | 0 | 5,600 | 5,600 |
| 1840 | 0 | 5,200 | 5,200 |
| 1841 | 0 | 4,800 | 4,800 |
| 1842 | 0 | 4,400 | 4,400 |
| 1843 | 0 | 4,000 | 4,000 |
| 1844 | 0 | 3,600 | 3,600 |
| 1845 | 0 | 3,200 | 3,200 |
| 1846 | 0 | 3,000 | 3,000 |
| 1847 | 0 | 2,900 | 2,900 |
| 1848 | 0 | 2,800 | 2,800 |
| 1849 | 0 | 2,700 | 2,700 |
| 1850 | 0 | 2,600 | 2,600 |
| 1851 | 0 | 2,500 | 2,500 |
| 1852 | 0 | 2,400 | 2,400 |
| 1853 | 0 | 2,300 | 2,300 |
| 1854 | 0 | 2,200 | 2,200 |
| 1855 | 0 | 2,100 | 2,100 |
| 1856 | 0 | 2,000 | 2,000 |
| 1857 | 0 | 1,900 | 1,900 |
| 1858 | 0 | 1,800 | 1,800 |
| 1859 | 0 | 1,700 | 1,700 |
| 1860 | 0 | 1,600 | 1,600 |
| 1879 | 0 | 154 | 154 |
| 1880 | 0 | 700 | 700 |
| 1881 | 0 | 1,200 | 1,200 |
| 1882 | 0 | 1,700 | 1,700 |
| 1883 | 0 | 2,200 | 2,200 |
| 1884 | 0 | 2,700 | 2,700 |
| 1885 | 0 | 3,200 | 3,200 |
| 1886 | 0 | 3,900 | 3,900 |
| 1887 | 0 | 2,000 | 2,000 |
| 1888 | 0 | 7,500 | 7,500 |
| 1889 | 0 | 5,170 | 5,170 |
| 1891 | 0 | 1,200 | 1,200 |
| 1892 | 0 | 2,400 | 2,400 |
| 1893 | 0 | 1,800 | 1,800 |
| 1917 | 0 | 12,075 | 12,075 |
| 1918 | 0 | 3,740 | 3,740 |
| 1919 | 0 | 47,603 | 47,603 |
| 1920 | 0 | 28,222 | 28,222 |
| 1921 | 0 | 117,923 | 117,923 |
| 1922 | 0 | 184,315 | 184,315 |
| 1923 | 0 | 546,400 | 546,400 |
| 1924 | 0 | 220,897 | 220,897 |
| 1925 | 0 | 81,690 | 81,690 |
| 1926 | 0 | 125,205 | 125,205 |
| 1928 | 0 | 65,316 | 65,316 |
| 1929 | 0 | 98,626 | 98,626 |
| 1930 | 0 | 62,786 | 62,786 |
| 1931 | 0 | 26,208 | 26,208 |
| 1932 | 0 | 10,777 | 10,777 |
| 1933 | 21,121 | 25,171 | 46,292 |
| 1934 | 0 | 128,537 | 128,537 |
| 1935 | 0 | 48,205 | 48,205 |
| 1936 | 0 | 114,460 | 114,460 |
| 1937 | 0 | 124,230 | 124,230 |
| 1938 | 0 | 152,323 | 152,323 |
| 1939 | 0 | 165,167 | 165,167 |
| 1940 | 0 | 173,383 | 173,383 |
| 1941 | 0 | 307,318 | 307,318 |
| 1942 | 0 | 400,280 | 400,280 |
| 1943 | 0 | 310,800 | 310,800 |
| 1944 | 0 | 268,056 | 268,056 |
| 1945 | 0 | 294,377 | 294,377 |
| 1946 | 25,000 | 352,050 | 377,050 |
| 1947 | 10,425 | 373,740 | 384,165 |
| 1948 | 103,201 | 473,474 | 576,675 |
| 1949 | 63,250 | 570,344 | 633,594 |
| 1950 | 141,538 | 708,744 | 850,282 |
| 1951 | 29,148 | 506,423 | 535,571 |
| 1952 | 16,000 | 538,830 | 554,830 |
| 1953 | 24,984 | 602,133 | 627,117 |
| 1954 | 14,990 | 546,549 | 561,539 |
| 1955 | 100,327 | 671,371 | 771,698 |
| 1956 | 362,771 | 797,039 | 1,159,810 |
| 1957 | 291,459 | 854,204 | 1,145,663 |
| 1958 | 339,572 | 769,597 | 1,109,169 |
| 1959 | 236,116 | 829,630 | 1,065,746 |
| 1960 | 274,758 | 937,080 | 1,211,838 |
| 1961 | 196,721 | 1,187,416 | 1,384,137 |
| 1962 | 981,598 | 86,351 | 1,067,949 |
| 1963 | 66,398 | 1,216,681 | 1,283,079 |
| 1964 | 94,284 | 1,418,831 | 1,513,115 |
| 1965 | 101,172 | 1,334,212 | 1,435,384 |
| 1966 | 123,902 | 1,030,433 | 1,154,335 |
| 1967 | 142,007 | 666,321 | 808,328 |
| 1968 | 182,328 | 471,331 | 653,659 |
| 1969 | 193,124 | 354,795 | 547,919 |
| 1970 | 419,697 | 280,920 | 700,617 |
| 1971 | 658,970 | 159,862 | 818,832 |
| 1972 | 316,634 | 136,001 | 452,635 |
| 1973 | 374,413 | 154,335 | 528,748 |
| 1974 | 374,243 | 315,929 | 690,172 |
| 1975 | 654,921 | 440,442 | 1,095,363 |
| 1976 | 569,828 | 1,046,243 | 1,616,071 |
| 1977 | 876,414 | 946,500 | 1,822,914 |
| 1978 | 964,807 | 1,246,576 | 2,211,383 |
| 1979 | 1,276,674 | 1,198,331 | 2,475,005 |
| 1980 | 1,787,530 | 714,404 | 2,501,934 |
| 1981 | 1,584,813 | 840,412 | 2,425,225 |
| 1982 | 1,174,016 | 774,901 | 1,948,917 |
| 1983 | 792,189 | 902,042 | 1,694,231 |
| 1984 | 1,168,951 | 794,644 | 1,963,595 |
| 1985 | 974,857 | 709,900 | 1,684,757 |
| 1986 | 480,350 | 537,925 | 1,018,275 |
| 1987 | 507,149 | 655,317 | 1,162,466 |
| 1988 | 551,824 | 519,034 | 1,070,858 |
| 1989 | 450,370 | 263,246 | 713,616 |
| 1990 | 1,455,357 | 211,473 | 1,666,830 |
| 1991 | 1,588,935 | 526,452 | 2,115,387 |
| 1992 | 588,522 | 767,592 | 1,356,114 |
| 1993 | 440,469 | 340,929 | 781,398 |
| 1994 | 502,547 | 86,019 | 588,566 |
| 1995 | 254,211 | 0 | 254,211 |
| 1996 | 142,030 | 0 | 142,030 |
| 1997 | 330,473 | 1,750 | 332,223 |
| *NOTE: Source: |