THE MINERAL INDUSTRY OF MAINE 387 
Table 4.—Em 
ployme 
nt and i 
njury ex 
perience 
in the mineral industries 
 
Year and industry 
Average 
men 
working 
daily 
Days 
active 
Mandays 
worked (thousands) 
Man- 
hours 
worked 
(thou- 
sands) 
 Number of Injury rates per 
    injuries million man-hours 
————-—— Fatal Non- Fre- Sever- 
 fatal quency ity 
 
1966: 
 Metal and peat  - - Nonmetal          Sand and gravel     Stone        
      Total '            
1967:P 
Metal and peat      
Nonmetal__...       
Sand and gravel     
Stone              
Total'           
32 
111 
1,446 
341 
1,930 
184 
182 
231 
250 
231 
6 
20 
335 
85 
446 
45 
163 
2,700 
695 
3,604 
 1 7 49.01 38,328  51 18.89 416  23 33.09 793 1 81 22.76 2,201 
 
 
70 
105 
1,490 
241 
215 
163 
16 
23 
243 
131 
184 
2,087 
 1 7.63 229 5 27.12 602 39 18.69 373 
 
 
465 
217 
101 
819 
1 15 19.54 8,342 
 
 
2,130 
180 
383 
3,221 
1 60 18.94 2,405 
 
'  Preliminary. 
Data may not add to totals shown because of independent rounding. 
 
REVIEW BY MINERAL COMMODITIES 
NONMETALS 
 
 Cement.-—Dragon Cement Co., Division of Martin Marietta Corp., produced
both finished portland and masonry cements. Shipments of both types were
greater than those of 1966. Cement rock, the principal raw material, was
quarried locally by the company. Purchased sand, gypsum, and iron-bearing
materials also were used as raw materials. The raw materials were fed into
the two rotary kilns in a slurry of controlled consistency for use in manufacturing
two types of portland cement: Type I—Il (general use) and Type III
(highearly-strength). 
 Portland cement was shipped chiefly by truck in both bulk and paper bags
to consumers in Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont.
Total apparent consumption of portland cement in Maine during 1967 was 987,413
barrels. Consumers of portland cement, in decreasing order of quantity, were
ready-mix concrete companies, concrete product manufacturers, and building
material dealers. 
 
 Clay.—Production of miscellaneous clay was reported from two pits
in Androscoggin County and three in Cumberland County, which again led in
production. Miscellaneous clay, the predominant kind of clay produced, was
used to manufacture building brick. A small quantity of stoneware clay recovered
from prop- 
erty in Hancock County was used to manufacture dinnerware, art pottery, fiowerpots,
and glazed ware. 
 
 Feldspar.—Output of marketable crude feldspar continued downwa—d
and was at its lowest level since 1963. The loss of experienced miners, primarily
through retirement, curtailed the production of feldspar and the industry
had difficulty in finding replacements. Production was reported only from
mines in Oxford County and the average value for crude material remained
at $6 per long ton. Feldspar from mines in Oxford County, together with a
substantial quantity of high potash feldspar from the Ruggles mine in Grafton,
N.H., was processed at West Paris, Oxford County, by Bell Minerals Co. The
ground feldspar was sold primarily for ceramic applications and was shipped
chiefly to consumers in Pennsylvania, New Jersey, and Ohio. Lesser quantities
were shipped to other States and some was exported to Africa and Canada.

 
 Gem Stones.—Various mineral specimens continued to be collected from
old mines, quarries, and dumps throughout the State. Mineral collectors were
particularly active in Oxford County, acquiring specimens of agate, autunite,
beryl, gemquality aquamarine, lithium minerals, and amethyst. 
 
 Lime.—Oxford Paper Co. at Rumford, Oxford County, produced high-calcium