Pulp Millstones - Duncan, British Columbia, Canada
Posted by: 
The A-Team
N 48° 48.112 W 123° 42.925
10U E 447465 N 5405677
These two millstones, which were formerly used in local pulp mills, are on display in front of the BC Forest Discovery Centre at 2892 Drinkwater Road in Duncan, British Columbia, Canada.
Waymark Code: WMN3Y2
Location: British Columbia, Canada
Date Posted: 12/21/2014
Views: 2
These sandstone millstones were quarried about 40 km to the north at the Coats family quarry on Gabriola Island sometime between 1933 and 1936. Millstones from the quarry were used in pulp mills up and down the coast of British Columbia, and some were even shipped to Scandinavia. They were used to grind blocks of wood into pulp to be used in paper-making, and would rotate at 220-225 rpm with a feed pressure of 60-125 psi. These stones were dangerous to operate, because flaws in the composition of the sandstone sometimes caused the stones to explode from the forces they were subjected to. Natural pulp millstones were phased out in the late-1930s and 1940s because artificial stones were found to be superior and could be produced with more consistent quality.
Each of these millstones is approximately 4-5 feet in diameter and has a grinding face 3-4 feet wide. Each is estimated to weigh between 2 and 4 tons.
Type of mill: Other
What did this millstone make?: Wood pulp
Status of Stone: Public Display
Website containing relating information: [Web Link]
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