Table III, Miscellaneous Information, Numbers Refer to Number of Persons Involved
Miscellaneous Information Numbers Refer to Number of Persons Involved
Terrain
1951-61
1959-61
1961
U.S.
CAN.
U.S.
CAN.
Rock
303
3
56
1
Snow
191
22
26
0
River
1
0
1
0
Unknown
0
0
0
0
Ascent or Descent
(River crossing not included)
Ascent
216
15
49
1
Descent
242
9
28
0
Unknown
36
1
6
0
Immediate Cause
Fall or slip on rock
179
3
27
1
Failure of piton
5
0
6
0
Falling rock or object
55
0
3
0
Failure of rappel
28
0
3
0
Slip on snow or ice
77
10
15
0
Fall into crevasse
12
4
1
0
Loss of control in voluntary glissade
25
0
4
0
Avalanche
45
7
3
0
Lightning
16
0
0
0
Stuck rope
5
0
0
0
Skiing
2
0
0
0
Faulty use of crampon
5
0
0
0
Fall in river
1
0
1
0
Exposure and/or exhaustion
22
1
12
0
Heat prostration
1
0
0
0
Illness, medical
3
0
1
0
Exceeding abilities
(inexperience)
11
0
3
0
Miscellaneous
4
0
4
0
Contributory Causes
Climbing unroped
130
4
15
1
Climbing alone
31
1
8
0
Attempt to exceed abilities
(inexperience)
65
7
8
0
Darkness
4
0
0
0
Inadequate equipment
26
0
5
0
Old rope
3
0
0
0
Piton failure
13
1
0
0
Bad weather
7
0
0
0
Exposure and/or exhaustion
7
0
1
0
Party separated
8
0
1
0
Age of Individuals
1951-61
U.S.
1959-61
CAN.
U.S.
1961
CAN.
“Boys”
6
0
0
0
Under 15
17
0
1
0
15-20 years
158
4
26
0
“Young or college age”
10
0
1
0
21-25
110
3
17
0
26-30
53
4
5
0
31-35
37
1
4
0
Over 35
42
7
13
1
Unknown
43
6
16
0
Unaffiliated with climbing groups
Unaffiliated
102
4
26
0
Not stated
192
1
16
0
Member of mountaineering club
201
20
41
1
Estimate of Experience
None or little
258
9
27
0
Moderate
131
9
26
0
Experienced
43
6
20
1
Unknown
62
1
10
0
Month of Year
January
13
0
0
0
February
27
0
3
0
March
18
0
6
0
April
28
0
6
0
May
38
0
6
0
June
53
0
10
1
July
104
17
27
0
August
95
8
11
0
September
50
0
5
0
October
23
0
0
0
November
25
0
7
0
December
8
0
2
0
Not specified
2
0
0
0