14

Photograph courtesy of the Ontario Ministry of Northern Development and Mines.
© Queen's Printer for Ontario, 1907. Reproduced with permission.

15

Locomotive 'Back Hoe' at the Martin International Trap Rock quarry.
1910
Bruce Mines, Ontario, Canada

16

Photo courtesy of the Bruce Mines Museum.

17

Martin International Trap Rock Company.
1910
Bruce Mines, Ontario, Canada

18

The Martin International Trap Rock quarry closed down in 1917 due to a shortage of ships, necessary to transport the trap rock. The ships were being utilized by the government in the First World War.
One story indicates that the works were eventually torn down to use the steel in the war effort.

Photo courtesy of the Bruce Mines Museum.