Knox County Historical Production Figures |
| YEAR | SURFACE | UNDERGROUND | TOTAL |
| 1890 | 0 | 80,105 | 80,105 |
| 1891 | 0 | 111,071 | 111,071 |
| 1892 | 0 | 105,980 | 105,980 |
| 1893 | 0 | 160,286 | 160,286 |
| 1894 | 0 | 72,858 | 72,858 |
| 1895 | 0 | 185,735 | 185,735 |
| 1896 | 0 | 217,040 | 217,040 |
| 1897 | 0 | 164,883 | 164,883 |
| 1898 | 0 | 285,322 | 285,322 |
| 1899 | 0 | 244,091 | 244,091 |
| 1900 | 0 | 311,698 | 311,698 |
| 1901 | 0 | 291,286 | 291,286 |
| 1902 | 0 | 465,986 | 465,986 |
| 1903 | 0 | 540,404 | 540,404 |
| 1904 | 0 | 584,095 | 584,095 |
| 1905 | 0 | 579,514 | 579,514 |
| 1906 | 0 | 664,576 | 664,576 |
| 1907 | 0 | 709,579 | 709,579 |
| 1908 | 0 | 520,089 | 520,089 |
| 1909 | 0 | 630,026 | 630,026 |
| 1910 | 0 | 661,823 | 661,823 |
| 1911 | 0 | 773,310 | 773,310 |
| 1912 | 0 | 831,484 | 831,484 |
| 1913 | 0 | 912,589 | 912,589 |
| 1914 | 0 | 822,348 | 822,348 |
| 1915 | 0 | 769,650 | 769,650 |
| 1916 | 0 | 771,685 | 771,685 |
| 1917 | 0 | 690,246 | 690,246 |
| 1918 | 0 | 669,437 | 669,437 |
| 1919 | 0 | 583,128 | 583,128 |
| 1920 | 0 | 573,600 | 573,600 |
| 1921 | 0 | 426,480 | 426,480 |
| 1922 | 0 | 427,460 | 427,460 |
| 1923 | 0 | 572,324 | 572,324 |
| 1924 | 0 | 452,360 | 452,360 |
| 1925 | 0 | 368,026 | 368,026 |
| 1926 | 0 | 381,350 | 381,350 |
| 1927 | 0 | 463,771 | 463,771 |
| 1928 | 18,100 | 264,561 | 282,661 |
| 1929 | 0 | 254,553 | 254,553 |
| 1930 | 0 | 287,731 | 287,731 |
| 1931 | 0 | 347,186 | 347,186 |
| 1932 | 0 | 336,876 | 336,876 |
| 1933 | 0 | 387,109 | 387,109 |
| 1934 | 0 | 458,375 | 458,375 |
| 1935 | 0 | 482,096 | 482,096 |
| 1936 | 0 | 574,021 | 574,021 |
| 1937 | 0 | 625,758 | 625,758 |
| 1938 | 0 | 533,726 | 533,726 |
| 1939 | 0 | 652,686 | 652,686 |
| 1940 | 0 | 665,151 | 665,151 |
| 1941 | 0 | 494,671 | 494,671 |
| 1942 | 0 | 738,578 | 738,578 |
| 1943 | 0 | 662,252 | 662,252 |
| 1944 | 0 | 764,651 | 764,651 |
| 1945 | 0 | 673,751 | 673,751 |
| 1946 | 0 | 530,583 | 530,583 |
| 1947 | 102,000 | 843,827 | 945,827 |
| 1948 | 173,742 | 846,084 | 1,019,826 |
| 1949 | 0 | 739,493 | 739,493 |
| 1950 | 32,588 | 587,629 | 620,217 |
| 1951 | 36,972 | 502,582 | 539,554 |
| 1952 | 1,734 | 245,862 | 247,596 |
| 1953 | 31,270 | 165,741 | 197,011 |
| 1954 | 0 | 145,184 | 145,184 |
| 1955 | 32,339 | 137,996 | 170,335 |
| 1956 | 177,655 | 233,805 | 411,460 |
| 1957 | 132,993 | 187,250 | 320,243 |
| 1958 | 90,536 | 142,219 | 232,755 |
| 1959 | 10,372 | 135,585 | 145,957 |
| 1960 | 54,260 | 209,071 | 263,331 |
| 1961 | 148,517 | 132,255 | 280,772 |
| 1962 | 129,974 | 211,694 | 341,668 |
| 1963 | 198,915 | 232,642 | 431,557 |
| 1964 | 54,800 | 238,428 | 293,228 |
| 1965 | 0 | 152,788 | 152,788 |
| 1966 | 40,250 | 172,784 | 213,034 |
| 1967 | 40,122 | 155,784 | 195,906 |
| 1968 | 16,602 | 147,995 | 164,597 |
| 1969 | 47,229 | 124,600 | 171,829 |
| 1970 | 572,977 | 78,985 | 651,962 |
| 1971 | 1,275,196 | 45,383 | 1,320,579 |
| 1972 | 728,088 | 23,700 | 751,788 |
| 1973 | 843,173 | 15,620 | 858,793 |
| 1974 | 1,459,576 | 39,158 | 1,498,734 |
| 1975 | 1,834,048 | 47,934 | 1,881,982 |
| 1976 | 993,331 | 118,192 | 1,111,523 |
| 1977 | 1,390,153 | 104,614 | 1,494,767 |
| 1978 | 1,441,872 | 183,520 | 1,625,392 |
| 1979 | 1,419,553 | 221,909 | 1,641,462 |
| 1980 | 1,527,777 | 377,824 | 1,905,601 |
| 1981 | 1,126,522 | 270,898 | 1,397,420 |
| 1982 | 610,934 | 207,443 | 818,377 |
| 1983 | 574,101 | 549,666 | 1,123,767 |
| 1984 | 517,173 | 897,567 | 1,414,740 |
| 1985 | 684,541 | 1,123,476 | 1,808,017 |
| 1986 | 804,120 | 1,048,446 | 1,852,566 |
| 1987 | 909,265 | 1,126,153 | 2,035,418 |
| 1988 | 975,434 | 820,321 | 1,795,755 |
| 1989 | 669,115 | 596,275 | 1,265,390 |
| 1990 | 564,886 | 582,242 | 1,147,128 |
| 1991 | 358,752 | 583,778 | 942,530 |
| 1992 | 562,270 | 591,291 | 1,153,561 |
| 1993 | 329,842 | 600,990 | 930,832 |
| 1994 | 278,614 | 807,670 | 1,086,284 |
| 1995 | 42,270 | 698,921 | 741,191 |
| 1996 | 54,342 | 591,410 | 645,752 |
| 1997 | 145,678 | 502,863 | 648,541 |
| *NOTE: Source: |