THE MINERAL INDUSTRY OF WASHINGTON 1 Includes special sands for construction
and industrial uses and sand and gravel for miscellaneous unspecifiedpurposes.
Lime.—Production of lime declined 10 percent from the 1966 total. Pacific
Lime, mc, Tacoma, continued manufacturing primary open-market lime, and sold
it to Pacific Northwest and Canadian customers for a wide variety of chemical
uses, and for construction and agricultural purposes. The Tacoma lime operation
received limestone by barge from company quarries at Texada Island, British
Columbia, Canada. Limestone was calcined to lime for use in sugar refining
at Utah-Idaho Sugar Co. plants in Grant and Yakima Counties. Calcium carbonate
sludge was converted to lime at seven pulp operations for their own use in
manufacturing pulp and paper products. 
 
 Magnesian Minerals.—Lessened demand for refractory-grade magnesia
by the steel industry resulted in a 48-percent decrease in magnesite tonnage
mined by Northwest Magnesite Co. Magnesite from the Finch, Keystone, and
Red Marble quarries was converted to refractory magnesia at the firm's Chewelah
plant. Shipments of the refractory-grade product by the company declined
26 percent. 
 Olivine production, remaining substantially constant with the 1966 total,
was from the Twin Sisters Mountain (Skagit 
837 
 
County) quarries of Northwest Olivine Corp. and Scheel Stone ' Co. Olivine
mined at the Twin Sisters quarry was trucked 20 miles to the Northwest Olivine
Co. grinding plant at Hamilton. Processed tonnages were marketed mainly for
use as foundry sand to Pacific Coast States and Canadian consumers. Olivine
also was mined at the Sisters Mountain quarry by Scheel Stone Co. and processed
at the Hamili:on grinding plant. 
 
 Pumice.—Output of pumice and pumiceous materials increased 33 percent
over the 1966 total. Ewer Lumber Co. continued to produce pumice for use
as concrete aggregate from a pit near the southeastern part of Chelan Lake,
Chelan County. The screened material was sold to Pacific Northwest and Canadian
consumers for use in manufacturing building blocks. Volcanic cinder, from
a talus slope in Kittitas County, was marketed for landscaping purposes.

 
 Sand and Gravel.—Sand and gravel output declined 3 percent from the
1966 total. 
Increased requirements for sand and gravel by the State highway department
partially offset a decline in demand for these materials by the U.S. Army
Corps of 
 
Table 6.—Sand and gravel sold or used by producers, by classes of operation
and uses 
(Thousand short tons and thousand dollars) 
 
Class of operation and use 
1966 
. 
1967 
—~ 
 
 
Quantity 
Value Quantity 
 — Value 
Commercial operations: 
Building                                      
Road material                                  
Fill                                          
Railroad ballast                                 
Other'                                          
 
Total                                       
 
Government-and-contractor operations: 
Building                                      
Road material                                  
Fill                                          
Other'                                       
 
 Total                                      All operations: 
Building                                      
Road material                                  
Fill                                          
Railroad ballast                                 
Other 1                                       
 
 Grand total                                  
6,801 
6,341 
3,046 
1,892 
766 
 $7,859 6,242 6,541 6,586 1,734 2,628 1,151 151 — 894 1,534 
$7,406 
6,368 
1,546 
104 
2,049 
 
18,846 
 18,179 17,141 
17,473 
 
1,280 
7,195 
1,516 
165 
 1,684 329 5,740 8,223 1,083 553 120 1,918 
455 
6,822 
289 
2,481 
 
10,156 
 8,627 11,023 
10,047 
 
8,081 
13,536 
4,562 
1 ,892 
931 
 9,543 6,571 12,281 14,809 2,817 3,181 1,151 151 1,014 3,452 
7,861 
13 190 
1.835 
104 
4,530 
 
29,002 
 26,806 28,164 
27,520