408 MINERALS YEARBOOK, 1967 
 
700 
 
 
 
 
 
 
600 — 500 — 
 
 
 
 
(1) 
~400 - 
0 
             Total 
0 
E300 - 
 
-J 
 
> 
 
200 - 
     / 
     / 
     / 
     I 
 100—    / 
  Iron ore~~ F ,~ / 
  % F 
 /, ~i I 
 ~..-. Cement7" 
 
Petroleum 
 0 I I I I I I I 
 1945 1950 1955 1960 1965 970 
Figure 1 .—Value of iron ore, petroleum, cement, and total value of
all 
minerals produced in Michigan. 
 Legislation and Government Programs. The act covers mines extracting minerals

—The 1967 Michigan Legislature enacted in solid form, and includes
milling, crushBill 3008, "Mine Safety Act of 1967," to ing, screening, washing,
flotation, pelletizprovide for the inspection of mines; the ing, smelting,
and other preparatory operations needed to render the minerals market- 
health and safety of persons employed in able. It also covers exploration
and develand about mines; mine inspectors; a mine opment of mineral properties.

safety board in the Department of Labor, The act will supersede legislation
that and to prescribe its powers and duties; and provided for the inspection
of metallic penalties for violations, mines by county mine inspectors.