Name Colony Area Mine
Owner American Colloid Co.
Operator American Colloid Co.
Type Surface
Product Bentonite

Year

Production
(Colony Mine only - 2003)
(Colony Mine Mine+East and West Mills - Other Years
(tons)

Employees (Colony Mine+Colony East and West Mills)

2010
1,082,228
87
2009
942,806
92
2008
1,866,450
160
2007
1,736,201
164
2006
1,751,457
158
2005
1,222,566
152
2004
1,584,526
151
2003
521,593
147
2002
1,370,244
144
2001
1,423,393
152
2000
1,310,374
152
1999
1,133,885
145

1998

1,247,608

142

1997

1,190,884

135

1996

1,332,919

125

1995

1,263,029

119

Notes: 2003, 2004 and 2005 is mine only production.
1995 to 2002 is combined production from the mine and mill.
Name Colony Mine/Mill
Owner Bentonite Performance Minerals
Operator Bentonite Performance Minerals
Type Surface
Product Bentonite

Year

Production
(Colony Mine Only)
(tons)

Employees (Colony Mine+Colony Mill)
2010
625,970
102
2009
368,837
84
2008
634,684
105
2007
729,384
101
2006
757,309
96
2005
667,738
82
2004
510,284
77
2003
470,231
76
2002
494,649
76
2001
437,717
78
2000
466,294
80
1999
499,043
78

1998

629,966

81

1997

494,965

85

1996

465,339

85

1995

578,778

83

1994

576,156

81

 
Name Oshoto Mine
Owner Black Hills Bentonite Corp.
Operator Black Hills Bentonite Corp.
Type Surface
Product Bentonite

Year

Production
(Oshoto Mine Only)
(tons)

Employees (Oshoto Mine)
2010
96,755
4
2009
77,468
4
2008
58,613
7
2007
6,906
4
2006
6,906
4
2006
73,867
3
2005
52,090
2
2004
37,896
2
2003
29,816
3
2002
48,477
3
2001
21,620
2
2000
984
1