Limestone: 
Riprap 
Flux 
Concreteaggregate and roadstone 
Railroadballast 
Agriculture                                  
Cement 
Lime 
Other 1                                       
 Total 2 37,703 
Marl:Agriculture 143 
 109 173 W W 
 13,391 15,789 11,270 13,638 
 6,479 7,748 5,952 7,313 
 W W 308 380 
 669 1,040 757 1,093 
 9,443 7,786 9,080 7,570 
 5,560 5,125 6,224 6,615 
 2,053 2,495 2,673 3,025 
 40,156 36,265 39,633 
 100 132 103 
 MINERALS YEARBOOK, 1967  face was completed with satisfactory re416 
 
Table 8.—Dimension stone sold or used by producers, by kinds 
Year 
Basalt 
 
Limestone 
 
Sandstone 
 
 
Total 
 
Short 
Value 
Short 
Value 
Short 
Value 
Short 
Value 
 
tons 
 
tons 
 
tons 
 
tons 
 
1963                         
 
1964               
 
1965                         
1966                         
1967                         
150 
$150 
4,938 
5,383 
5,286 
4,266 
3,241 
$60,371 
68,711 
76,989 
64,166 
61,150 
8,937 
8,306 
6,396 
8,109 
2,770 
$62,348 
62,030 
42,760 
53,510 
16,690 
13,875 
13,839 
11,682 
12,375 
6,011 
$122,719 
130,891 
119,749 
117,676 
77,840 
 
Table 9.—Crushed and broken stone sold or used by producers, by kinds
and uses 
(Thousand short tons and thousand dollars) 
 1966 1967 
Kind and use 
 Quantity Value Quantity Value 
Basalt: Concrete aggregate and roadstone 5 $6 
Granite: Exposed aggregate 
 27 $35 
 3 62 
 
 
 
 
 
 
 
 Grand total 2 37,852 40,262 36,426 39,832 
 
 
W Withheld to avoid disclosing individual company confidential data; included
with "Other." ' Includes limestone used for asphalt and other miscellaneous
filler, chemicals, dust for coal mines, mineral 
food, poultry grit, stone sand, whiting or whiting substitutes, other uses,
and uses indicated by symbol W. 2 Data may not add to totals shown because
of independent rounding. 
 
for road use. Marl was produced in 11 counties and sold for agricultural
use. 
 
 Sulfur.—Byproduct sulfur was recovered from crude petroleum at oil
refineries in Alma, Detroit, and Trenton. Output increased over that of 1966.

 
 Veriniculite.—Crude vermiculite, mined in Southern and Western States,
was exfoliated at a plant in Dearborn and used for insulation, plaster, concrete
aggregate, agricultural application, and other uses. 
 
METALS 
 
 Copper.—Production of copper in terms of recoverable metal was 20
percent less than in 1966, due chiefly to a 4-month-long labor strike at
the White Pine Copper Co. property in Ontonagon County, and a strike, lasting
nearly 3 weeks, at the Calumet Division of Calumet & Hecla, Inc., at
Calumet. The average weighted price for 
copper increased to 38.2 cents per pound. On May 6, the Quincy Mining Co.

closed its dredge and copper reclamation plant at Torch Lake. The Quincy
smelter was closed down with the discontinuation of the reclamation plant,
but the furnace is being rebuilt, connected to gas firing instead of coal,
and will be used to smelt copper scrap. 
 Copper Range Co. closed its Champion mine in September and discontinued
its tailings-reclamation program in November. 
 Calumet & Hecla, Inc., cksed the Centennial No. 2 mine, but continued
development of the Kingston and Centennial No. 6 mines during the year. Diamond
drilling of the Hills Creek project was started in 1967 with holes located
to intersect the lode substantially below and northerly from the old workings
in the Calumet conglomerate lode. One drill hole from the sur