Table 6.—Principal 
Commodity and company Type of 
activity 
producers 
 County Address 
Cement (portland): 
 Alpha Portland Cement Co Plant Frederick 
 Lehigh Portland Cement Co.' do. - -- - - Carroll 
- - - do - - - - - Washington 
Plant Frederick Lime Kiln, Md. 
Mine.. - - - - -- Allegany P. 0. Box 363 
 Frostburg, Md. 
 Do do Frederick 
 Do do Baltimore City... - 
Champion Brick Co do Baltimore 
 THE MINERAL INDUSTRY OF MARYLAND 395See footnotes at end of table. 
 
 Vermiculite (Exfoliated) .—One operator in Prince Georges County processed
crude vermiculite obtained from sources outside the State. The material was
sold for use in insulation, concrete and plaster aggregate, and for agricultural
purposes. 
 
MINERAL FUELS 
 
 Coal (Bituminous) .—Fifty—three mines, including 19 underground,
31 strip, and three auger, in Allegany and Garrett Counties produced about
7 percent more coal than in 1966. About two-thirds of all coal mined came
from strip mines. Of the total production 46 percent was crushed before being
sold. Coal mined underground brought an average price of $4.45 per ton, up
63 cents over the 1966 price. Coal from strip mines was sold at an average
price of $3.12 compared with $3.44 during 1966. Augermined coal declined
in price from $3.44 to $2.36 in 1967. The average price for all coal mined
was $3.48, while in 1966 it was $3.57. 
 Coke and Chemicals.—Coke and coal chemicals were produced by Bethlehem
Steel Corp., at its Sparrows Point plant. Coproducts and byproducts included
coke breeze, coke oven gas, ammonium sulfate, soft tar pitch, crude tar,
crude chemical oil, crude light oil and derivatives (benzene, toluene, and
xylene), and naphthalene. 
 Natural Gas and Petroleum.—Natural gas was produced from 13 wells
in the Mountain Lake Park field and the Negro Mountain field, both in Garrett
County. The Accident field, formerly a producing field, was converted to
a gas storage reservoir. Total production remained about the same as that
of 1966. American Oil Co. and Chevron Oil Co. each refined crude petroleum
at refineries located near Baltimore. Total throughput was 20,500 barrels
per stream day, up 5.7 percent from that of the preceding year. 
 
 Peat.—Bogs in Garrett County and Kent County yielded reed-sedge and
humus peat. The commodity was processed and sold for soil improvement in
both bulk and packaged forms. 
 
METALS 
 
 *Copper.—One plant in Baltimore and one at Hawkins Point, Anne Arundel
County refined copper from anodes shipped into the State. Some gold and silver
were produced as byproducts. 
 
 Iron and Steel.—Basic and offgrade pig iron, steel ingot, and semifabricated
products were produced by Bethlehem Steel Corp., at its Sparrows Point plant.

 
 Lead.—Lead, lead alloys, and other alloys and products were produced
at three plants in Baltimore. The plants consumed lead remelt, primary metals,
and scrap. 
 
 
 
 
Marquette Cement Manufacturing Co.2 
Cement (masonry): 
M. J. Grove Co., Division of the Flintkote Co. 
Clays: 
Ball: 
United Sierra Division Cyprus Mines Corp. 
Fire: 
Kaiser Refractories, Division of Aluminum & Chemical 
Corp. 
Maryland Clay and/or William D. Bowm.~n 
Miscellaneous clay and shale: 
Baltimore Brick Co 
Pit Baltimore 
Pit Harford 
- - Ao Baltimore 
15 South Third St. 
Easton, Pa. 
718 Hamilton St. 
Allentown, Pa. 
20 No. Wacker Dr. 
Chicago, Ill. 
P. 0. Box 1201 Trenton, N.J. 
R.F.D. 2, Box 308 Aberdeen, Md. 
3200 East Madison St. Baltimore, Md. 
Do. 
Do. 
7600 Pulaski Highway Baltimore, Md.