HOW MANY ILLINOIS COUNTIES PRODUCE MINERAL COMMODITIES?
In 1963, 99 of the 102 counties of Illinois reported mineral production of one kind or another.
Figure 6—Percentage diagram of Illinois mineral production value for 1963.
Petroleum and Natural Gas 36.3% Coal 31.9% Stone Products 15.2% Clay Products 8.8% Sand and Gravel 5.9% Fluorspar and Metals 1.9%