--SURFACE STORAGE OF EXPLOSIVE MATERIAL
----------------------+-----------------------------------------------------
Quantity of explosive| Minimum separation distances (feet)
material (pounds) |----------------------------|--------------------------
----------------------+ From mine buildings, dams | Between magazines
| and electric substations |------------|--------------
Not over |------------|----------------| |
| Barricaded| Unbarricaded | Barricaded| Unbarricaded
----------------------+-----------+---------------+-----------+-------------
| | | |
5 | 70 | 140 | 6 | 12
10 | 90 | 180 | 8 | 16
20 | 110 | 220 | 10 | 20
30 | 125 | 250 | 11 | 22
40 | 140 | 280 | 12 | 24
50 | 150 | 300 | 14 | 28
75 | 170 | 340 | 15 | 30
100 | 190 | 380 | 16 | 32
125 | 200 | 400 | 18 | 36
150 | 215 | 430 | 19 | 38
200 | 235 | 470 | 21 | 42
250 | 255 | 510 | 23 | 46
300 | 270 | 540 | 24 | 48
400 | 295 | 590 | 27 | 54
500 | 320 | 640 | 29 | 58
600 | 340 | 680 | 31 | 62
700 | 355 | 710 | 32 | 64
800 | 375 | 750 | 33 | 66
900 | 390 | 780 | 35 | 70
1,000 | 400 | 800 | 36 | 72
1,200 | 425 | 850 | 39 | 78
1,400 | 450 | 900 | 41 | 82
1,600 | 470 | 940 | 43 | 86
1,800 | 490 | 980 | 44 | 88
2,000 | 505 | 1,010 | 45 | 90
2,500 | 545 | 1,090 | 49 | 98
3,000 | 580 | 1,160 | 52 | 104
4,000 | 635 | 1,270 | 58 | 116
5,000 | 685 | 1,370 | 61 | 122
6,000 | 730 | 1,460 | 65 | 130
7,000 | 770 | 1,540 | 68 | 136
8,000 | 800 | 1,600 | 72 | 144
9,000 | 835 | 1,670 | 75 | 150
10,000 | 865 | 1,730 | 78 | 156
12,000 | 875 | 1,750 | 82 | 164
14,000 | 885 | 1,770 | 87 | 174
16,000 | 900 | 1,800 | 90 | 180
18,000 | 940 | 1,880 | 94 | 188
20,000 | 975 | 1,950 | 98 | 196
25,000 | 1,055 | 2,000 | 105 | 210
30,000 | 1,130 | 2,000 | 112 | 224
35,000 | 1,205 | 2,000 | 119 | 238
40,000 | 1,275 | 2,000 | 124 | 248
45,000 | 1,340 | 2,000 | 129 | 258
50,000 | 1,400 | 2,000 | 135 | 270
55,000 | 1,460 | 2,000 | 140 | 280
60,000 | 1,515 | 2,000 | 145 | 290
65,000 | 1,565 | 2,000 | 150 | 300
70,000 | 1,610 | 2,000 | 155 | 310
75,000 | 1,655 | 2,000 | 160 | 320
80,000 | 1,695 | 2,000 | 165 | 330
85,000 | 1,730 | 2,000 | 170 | 340
90,000 | 1,760 | 2,000 | 175 | 350
95,000 | 1,790 | 2,000 | 180 | 360
100,000 | 1,815 | 2,000 | 185 | 370
110,000 | 1,835 | 2,000 | 195 | 390
120,000 | 1,855 | 2,000 | 205 | 410
130,000 | 1,875 | 2,000 | 215 | 430
140,000 | 1,890 | 2,000 | 225 | 450
150,000 | 1,900 | 2,000 | 235 | 470
160,000 | 1,935 | 2,000 | 245 | 490
170,000 | 1,965 | 2,000 | 255 | 510
180,000 | 1,990 | 2,000 | 265 | 530
190,000 | 2,010 | 2,010 | 275 | 550
200,000 | 2,030 | 2,030 | 285 | 570
210,000 | 2,055 | 2,055 | 295 | 590
230,000 | 2,100 | 2,100 | 315 | 630
250,000 | 2,155 | 2,155 | 335 | 670
275,000 | 2,215 | 2,215 | 360 | 720
300,000 | 2,275 | 2,275 | 385 | 770
----------------------+-----------+---------------+-----------+---------
For purposes of this table, "barricaded" means that the storage facility
containing explosive material is screened effectively by a natural barricade
or an artificial barricade consisting of a mound or revetted wall of earth
with a minimum thickness of three feet.
TABLE 2--MSHA TABLE OF SEPARATION DISTANCES
------------+------------------------------+-------------
Quantity of | Storage facilities--minimum |
ammonium | separation distances when | Minimum
nitrate of | barricaded * (feet) | thickness of
blasting |----------------|---------------| artificial
agents | | | barricades**
(pounds) | Ammonium | Blasting | (inches)
------------+ nitrate | agents |
Not over | | |
------------+---------------+--------------+-------------
100 | 3 | 11 | 12
300 | 4 | 14 | 12
600 | 5 | 18 | 12
1,000 | 6 | 22 | 12
1,600 | 7 | 25 | 12
2,000 | 8 | 29 | 12
3,000 | 9 | 32 | 15
4,000 | 10 | 36 | 15
6,000 | 11 | 40 | 15
8,000 | 12 | 43 | 20
10,000 | 13 | 47 | 20
12,000 | 14 | 50 | 20
16,000 | 15 | 54 | 25
20,000 | 16 | 58 | 25
25,000 | 18 | 65 | 25
30,000 | 19 | 68 | 30
35,000 | 20 | 72 | 30
40,000 | 21 | 76 | 30
45,000 | 22 | 79 | 35
50,000 | 23 | 83 | 35
55,000 | 24 | 86 | 35
60,000 | 25 | 90 | 35
70,000 | 26 | 94 | 40
80,000 | 28 | 101 | 40
90,000 | 30 | 108 | 40
100,000 | 32 | 115 | 40
120,000 | 34 | 122 | 50
140,000 | 37 | 133 | 50
160,000 | 40 | 144 | 50
180,000 | 44 | 158 | 50
200,000 | 48 | 173 | 50
220,000 | 52 | 187 | 60
250,000 | 56 | 202 | 60
275,000 | 60 | 216 | 60
300,000 | 64 | 230 | 60
-------------+---------------+--------------+----------
* When the ammonium nitrate or blasting agents are not barricaded, the
distances shown in the table must be multiplied by six.
** For purposes of this table, "barricaded" means that the storage facility
is screened effectually by a natural barricade or an artificial barricade
consisting of amount of revetted wall or earth with the prescribed minimum
thickness.
Note: At 56 FR 69596, December 30, 1993, appendix I to subpart E of part 57 is
stayed until January 31, 1994.