Average 
  menYear and industry working  daily 
Days 
active 
Man- 
days 
worked 
(thou- 
Man- 
hours 
worked 
(thou- 
Number of injuries 
— Fatal Non- 
Injury rates per million man-hours 
—~ 
Fre- Se- 
 
 
sands) 
sands) 
fatal 
quency verity 
1966: 
 
 
 
 
 
Coal 217 
197 
43 
337 
 7 
20.75 842 
Metal 323 
244 
79 
651 
 11 
17.44 456 
 Nqnmetal 558 Sand and gravel 396 Stone 1,136 
 Total 1 2,630 
 
1967: 
243 
265 
268 
135 
105 
305 
1,082 
889 
2,527 
 23 
 22 
 1 62 
 21.26 1,741 24.74 809 24.93 4,916 
 
253 
666 
5,467 
1 125 
23.052,853 
 
 
 
 
 
 
Coal 210Metal 400Nonmetal 525Sand and gravel 265Stone 1,165 
210 
270 
241 
276 
263 
44 
108 
127 
73 
306 
335 
867 
1,009 
617 
2,556 
 1 7 1 34 1 30 
 17 
 70 
23.88 18,76740.38 14,52430.71 8,21627.55 31927.38 623 
Total' 2,565 
256 
658 
5,385 
3158 
29.90 5,378 
P Preliminary. 
1 Data may not add to total shown because of independent rounding. 
 THE MINERAL INDUSTRY OF OKLAHOMA 649  aging 5,366 feet in depth in constrast
to anaverage depth of 6,046 feet in 1966. The 
 
Table 4.—Employment and injury experience in the mineral industries

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Under the Oklahoma Employment Security Act, which covers establishments employing
four or more persons, the mineral industries in 1967 paid $305 million in
wages to 39,300 persons compared with $299 million in wages paid to 40,600
persons in 
1966. 
 
 Government Programs.—Authorized lock and dam structures in the Arkansas-Verdigris
Rivers Navigation System in Oklahoma were under construction at the end of
1967—lock and dam No. 14, Fort Smith, Ark., No. 15 (Robert S. Kerr),
and No. 16 (Webbers Falls) on the Arkansas River and Nos. 17 and 18 on the
Verdigris River. Construction of the powerhouse at Keystone Dam on the Arkansas
River west of Tulsa neared completion. 
 Construction continued at other Tulsa District, U.S. Army Corps of Engineers
projects as follows: Broken Bow Dam on 
Mountain Fork River and Pine Creek Dam on Little River in McCurtain County;
and the low water regulating dam below Keystone Dam. 
 The Bureau of Reclamation, U.S. Department of the Interior, completed the
Arbuckle Dam on Rock Creek southwest of Sulphur, Murray County. 
 Construction was nearly complete at the Chimney Hollow pumped storage project
of the Grand River Dam Authority. 
 Payments were made to mine operators in the Tn-State, Ottawa County, under
the Lead-Zinc Mining Stabilization Program as the market price of lead dropped
below 14.5 cents per pound (price at which payment is made) to 14 cents per
pound on October 10, 1966. Zinc producers became eligible May 1, 1967, when
the market price fell to 13.5 cents per pound, a full cent less than that
at which payment is made. 
 
REVIEW BY MINERAL COMMODITIES 
 
MINERAL FUELS 
 
 Proved recoverable reserves in each of the three liquid mineral fuel categories
declined in 1967, the first triple loss recorded in modern Oklahoma oil history,
according to the American Petroleum Institute and the American Gas Association.
A combination of fewer discoveries and increased production from existing
reserves resulted 
~n the decrease of crude petroleum, natural gas, and natural gas liquid reserves.

 The American Association of Petroleum Geologists statistical data on well
drilling indicated that Oklahoma, with 437 wells, ranked fifth in the Nation
in exploratory drilling. Accumulated exploratory drilling totaled 2.3 million
feet with wells aver-