Johnson County Historical Production Figures |
| YEAR | SURFACE | UNDERGROUND | TOTAL |
| 1879 | 0 | 169 | 169 |
| 1880 | 0 | 300 | 300 |
| 1881 | 0 | 1,000 | 1,000 |
| 1882 | 0 | 5,000 | 5,000 |
| 1883 | 0 | 10,000 | 10,000 |
| 1884 | 0 | 15,000 | 15,000 |
| 1885 | 0 | 18,000 | 18,000 |
| 1889 | 0 | 32,347 | 32,347 |
| 1890 | 0 | 28,805 | 28,805 |
| 1891 | 0 | 21,069 | 21,069 |
| 1892 | 0 | 27,450 | 27,450 |
| 1893 | 0 | 24,859 | 24,859 |
| 1894 | 0 | 16,902 | 16,902 |
| 1895 | 0 | 10,679 | 10,679 |
| 1896 | 0 | 6,672 | 6,672 |
| 1897 | 0 | 4,005 | 4,005 |
| 1898 | 0 | 10,964 | 10,964 |
| 1899 | 0 | 11,381 | 11,381 |
| 1900 | 0 | 15,635 | 15,635 |
| 1901 | 0 | 39,034 | 39,034 |
| 1902 | 0 | 59,407 | 59,407 |
| 1903 | 0 | 69,024 | 69,024 |
| 1904 | 0 | 26,229 | 26,229 |
| 1905 | 0 | 53,745 | 53,745 |
| 1906 | 0 | 98,193 | 98,193 |
| 1907 | 0 | 131,649 | 131,649 |
| 1908 | 0 | 154,459 | 154,459 |
| 1909 | 0 | 206,326 | 206,326 |
| 1910 | 0 | 466,901 | 466,901 |
| 1911 | 0 | 800,416 | 800,416 |
| 1912 | 0 | 911,087 | 911,087 |
| 1913 | 0 | 841,356 | 841,356 |
| 1914 | 0 | 940,340 | 940,340 |
| 1915 | 0 | 950,453 | 950,453 |
| 1916 | 0 | 1,061,481 | 1,061,481 |
| 1917 | 0 | 959,958 | 959,958 |
| 1918 | 0 | 791,241 | 791,241 |
| 1919 | 0 | 824,229 | 824,229 |
| 1920 | 0 | 772,286 | 772,286 |
| 1921 | 0 | 713,347 | 713,347 |
| 1922 | 0 | 307,299 | 307,299 |
| 1923 | 0 | 693,409 | 693,409 |
| 1924 | 0 | 1,021,576 | 1,021,576 |
| 1925 | 0 | 1,173,040 | 1,173,040 |
| 1926 | 0 | 1,223,396 | 1,223,396 |
| 1927 | 0 | 1,219,185 | 1,219,185 |
| 1928 | 0 | 1,183,075 | 1,183,075 |
| 1929 | 0 | 1,535,802 | 1,535,802 |
| 1930 | 0 | 1,220,602 | 1,220,602 |
| 1931 | 0 | 859,393 | 859,393 |
| 1932 | 0 | 711,083 | 711,083 |
| 1933 | 0 | 702,524 | 702,524 |
| 1934 | 0 | 889,211 | 889,211 |
| 1935 | 0 | 628,659 | 628,659 |
| 1936 | 0 | 806,166 | 806,166 |
| 1937 | 0 | 858,447 | 858,447 |
| 1938 | 0 | 743,885 | 743,885 |
| 1939 | 0 | 616,925 | 616,925 |
| 1940 | 0 | 831,181 | 831,181 |
| 1941 | 0 | 737,295 | 737,295 |
| 1942 | 0 | 695,345 | 695,345 |
| 1943 | 0 | 721,887 | 721,887 |
| 1944 | 0 | 850,734 | 850,734 |
| 1945 | 0 | 695,957 | 695,957 |
| 1946 | 0 | 797,559 | 797,559 |
| 1947 | 0 | 2,208,792 | 2,208,792 |
| 1948 | 0 | 535,173 | 535,173 |
| 1949 | 0 | 802,181 | 802,181 |
| 1950 | 0 | 852,368 | 852,368 |
| 1951 | 0 | 846,319 | 846,319 |
| 1952 | 0 | 497,220 | 497,220 |
| 1953 | 0 | 459,050 | 459,050 |
| 1954 | 16,593 | 369,189 | 385,782 |
| 1955 | 0 | 517,630 | 517,630 |
| 1956 | 0 | 594,483 | 594,483 |
| 1957 | 0 | 454,055 | 454,055 |
| 1958 | 1,750 | 363,711 | 365,461 |
| 1959 | 640 | 277,783 | 278,423 |
| 1960 | 0 | 264,534 | 264,534 |
| 1961 | 0 | 194,268 | 194,268 |
| 1962 | 0 | 181,178 | 181,178 |
| 1963 | 0 | 248,392 | 248,392 |
| 1964 | 143,969 | 237,213 | 381,182 |
| 1965 | 2,050 | 215,357 | 217,407 |
| 1966 | 140,196 | 206,329 | 346,525 |
| 1967 | 156,515 | 231,163 | 387,678 |
| 1968 | 572,391 | 183,250 | 755,641 |
| 1969 | 510,206 | 248,703 | 758,909 |
| 1970 | 1,904,560 | 295,326 | 2,199,886 |
| 1971 | 2,354,595 | 230,857 | 2,585,452 |
| 1972 | 1,943,681 | 210,398 | 2,154,079 |
| 1973 | 722,683 | 148,394 | 871,077 |
| 1974 | 1,265,549 | 140,233 | 1,405,782 |
| 1975 | 1,263,503 | 150,421 | 1,413,924 |
| 1976 | 2,719,413 | 90,091 | 2,809,504 |
| 1977 | 2,993,057 | 122,848 | 3,115,905 |
| 1978 | 1,955,042 | 254,265 | 2,209,307 |
| 1979 | 1,559,893 | 315,874 | 1,875,767 |
| 1980 | 861,345 | 398,762 | 1,260,107 |
| 1981 | 444,049 | 435,120 | 879,169 |
| 1982 | 499,142 | 518,428 | 1,017,570 |
| 1983 | 250,287 | 251,544 | 501,831 |
| 1984 | 692,722 | 390,023 | 1,082,745 |
| 1985 | 516,383 | 151,673 | 668,056 |
| 1986 | 169,196 | 119,427 | 288,623 |
| 1987 | 363,174 | 307,564 | 670,738 |
| 1988 | 323,420 | 1,048,834 | 1,372,254 |
| 1989 | 106,048 | 1,899,682 | 2,005,730 |
| 1990 | 73,077 | 1,448,903 | 1,521,980 |
| 1991 | 117,043 | 1,563,470 | 1,680,513 |
| 1992 | 1,733,643 | 1,527,505 | 3,261,148 |
| 1993 | 55,111 | 3,221,312 | 3,276,423 |
| 1994 | 85,522 | 1,395,769 | 1,481,291 |
| 1995 | 41,129 | 1,208,395 | 1,249,524 |
| 1996 | 222,871 | 1,363,381 | 1,586,252 |
| 1997 | 26,112 | 1,327,652 | 1,353,764 |
| *NOTE: Source: |