Type of material processed and method of recovery 
 
Lode: 
 
 
 
 
 
Concentration and smelting of 
 concentrates 8,362 
 
Direct smelting: 
 
1,946,091 
117,615,200 
431,500 
3,321,500 
 
 
 
 
 
 
Ore                    
Old tailings             
Precipitates 
Oldslag                        
 
Total                 
932 
351 
       
97,528 
20,192 
 
2,627 
562,800 
5,900 
1 12,782,100 
  
1,008,800 
2,000 
 
353,700 
343,500 
5,300 
 
3,011,700 
 
1,283 
120,347 
13,350,800 
1,364,500 
3,360,500 
Placer                         
141 
26 
 
 
 
Grand total  
9,786 
2,066,464 
130,966,000 
1,796,000 
6,682,000 
1 Includes small amount of copper from old slag. 
 THE MINERAL INDUSTRY OF MONTANA 493 
 
 
Table 12.—Mine production of gold, silver, copper, lead, and zinc,
in 1967, by types of 
material processed and methods of recovery, in terms of recoverable metals

 Gold Silver Copper Lead Zinc 
 (troy (troy (pounds) (pounds) (pounds) 
 ounces) (ounces) 
 
 
 
 
 
 
 
 
 
 
 
Table 13.—Mine production of gold, silver, copper, lead, and zinc in
Silver Bow County, 
in terms of recoverable metals 
 
Material 
Gold 
Silver 
. 
Year 
 Mines producing  sold or  treated 1—  (thousand  Lode Placer  short
  tons) 
(lode and 
placer) 
 
(troy ounces) 
(lode and 
placer) 
 
(thousand 
troy ounces) 
1963                                  
1964                                  
1965                                  
1966                                  
1967                                  
 10 2 9,346 10  14,694 
 8 2 15,462 5  17,503 5  9,041 
14,287 
20,999 
18,420 
21,608 
8,339 
3,951 
4,614 
4,790 
4,864 
1,856 
1882—1967                                           
2347,728 
2,432,166 
645,036 
 
 Copper Lead 
(short tons) (short tons) 
Zinc 
(short tons) 
Total value 
(thousands) 
1963                                  
1964                                  
1965                                  
1966                                  
1967                                  
 
1882—1967                             
 79,636 3,185 103,600 2,678 115,279 4,594 127,885 2,411 65,448 64 
24,140 
20,239 
25,629 
22,284 
816 
$60,850 
80,455 
97,373 
106,749 
53,450 
 
 8,230,420 415,425 
2,406,818 
4,025,108 
1 Does not include gravel washed. 
2 Complete data not available: 1882—1904. 
 
 At the Mountain Con mine, the program of enlarging haulageways and track
continued. The 4500 level was enlarged from 9 by 7 feet to 11 by 9 feet,
and the track was changed from 18 to 36 gage. A new control tower, overlooking
the Berkeley pit, was equipped with radio and closed circuit television to
monitor pit operations. Forty-six 65-ton ore trucks at the Berkeley pit were
phased out and replaced by 100ton trucks. 
 An addition to the Butte concentrator, designed to increase recovery by
treating acid-soluble ores not amenable to standard flotation procedures,
was completed. In- 
stallation of X-ray analysis equipment for automatic "onstream" analyses
of copper ores every 20 minutes also was completed. 
 A new plant was constructed at the Anaconda Reduction Works to receive copper
concentrates, shipped as slurry in tank cars from Butte. Two converters and
a $2.5 million, 100-ton overhead crane began operating in the converter building
at the smelter, and two Allis-Chalmers multistage centrifugal compressors
were installed. Construction was begun on an additional Cottrell precipitator.

 Exploration programs in Montana. were actively carried out by several major
mm-