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Photographer's Note

From the Michigan Historical Marker on-site:

WORLD'S LARGEST LIMESTONE QUARRY
Limestone is a mineral raw material essential in making steel, chemicals, and cement. Henry H. Hindshaw, a geologist, established in 1908-09 the commercial value of this area's limestone for industry. The high purity of this deposit and the availability of water transportation led to the development here of a port and quarry. Both are named Calcite, after the principal ingredient of the stone. The Michigan Limestone and Chemical Company, founded in 1910, began operation in 1912. Purchased by Carl D. Bradley and the United States Steel Corporation in 1920, the company came under the ownership of U.S. Steel upon Bradley's death in 1928. In 1951 the company became a division of the corporation. Self-unloaders of the division's Bradley Transportation Line carry limestone from this, the world's largest limestone quarry, to industrial ports around the Great Lakes.
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From the Oglebay Norton Minerals website:

O-N Minerals' Calcite Operation is located near Rogers City, MI, on the northern end of Michigan's Lower Peninsula on the shores of northern Lake Huron. The very large reserve has been producing high-calcium carbonate limestone for more than 85 years, shipping between 7 and 10.5 million net tons (NT) per year, depending on market demand.

Our Calcite Operation produces nine base product sizes, from 5-1/2 inches down to sand-sized particles. These products can be blended together to meet most sizing specifications. We utilize a Quality Management System that is ISO 9001:2000 Certified to assure that customers will receive the product that meets their requirements. The quarry’s reserves have been extensively mapped, and this mapping is regularly updated to provide the customer with the consistent quality product specified.
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About The Loader:
The 994D loader dumping the stone here weighs over 400,000 lbs. or close to 215 tons and comes standard with a 23 cubic yard bucket on it. The tires weigh five-tons each and cost over $50,000 to produce. There is one still larger mining loader than this, but the 994 and 994D are the most popular units in the industry.

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