The keel was laid May 17, 1967 at Davie Shipbuilding Ltd., Lauzon, QC for their hull # 661 which has proven to be the last classic straight deck bulk carrier (wheelhouse forward) built for the Canada Steamship Lines fleet of Montreal, QC. The vessel was launched December 12, 1967 and christened Frontenac (5) for Canada Steamship Lines, Inc. The Frontenac was named in honor of Mr. Louis de Buade, Comte de Frontenac at Palluau who was born in 1620 and was the governor of New France from 1672 to 1682 and 1689 until he died in 1698. He had been given authority by the French government to preside over all French possessions in North America. The new laker was commissioned on May 13, 1968 and loaded 25,492 tons (25,902 mt) of iron ore at Pointe Noire, QC on May 14 for her maiden voyage to Hamilton, ON; then on to Thunder Bay, ON for a load of grain to Montreal, QC.

With a capacity of 28,000 tons (28,450 mt) as built, the Frontenac only remained a "straight decker" for 5 years. During the winter of 1972/73, she was converted to a self-unloader by Collingwood Shipyards, Collingwood, ON (their hull # 204). Her conversion became the first installation of a stern mounted unloading system. All previous conversions had featured the forward mounted "A-frame" and discharge boom.

The self-unloading bulk carrier is powered by a Sulzer 6RND76 two stroke cycle, single acting 6-cylinder 9,600 b.h.p. (7,061 kW) turbo-charged diesel engine built by Sulzer Brothers Ltd., Winterthur, Switzerland burning intermediate grade 180 fuel. The power is fed to a single controllable pitch propeller giving her a rated service speed of 17 m.p.h. She has an 800 h.p. (595 kW) bow thruster. The Frontenac can carry up to 26,822 tons (27,251 mt) of iron ore, sand or stone at a mid-summer draft of 27' 08" (8.44m) and 25,197 tons (25,600 mt) at the new Seaway draft of 26' 06" (8.08m). Eighteen hatches service 6 holds where she has the cubic capacity to carry 23,200 net tons (20,714 tons or 21,047 mt) of coal. The Frontenac's self-unloading system consists of twin hopper type cargo holds with new hydraulically operated cargo gates of a streamlined design with nylon running surfaces between the gate and track reducing friction. These new gates were installed during the 2003/04 winter lay-up by Fabmar Metals of Thunder Bay. The running surfaces replaced the older design of wheels or rollers to open and close the gates. The cargo is fed to 2 continuous loop belt conveyors to a 257' 06" (79.86m) discharge boom. The system can unload at a rate of up to 5,588 tons (5,500 mt) or iron ore or 4,064 tons (4,000 mt) of coal per hour and is equipped with an environmental containment and recovery system (ECARS). The system is optimized for the handling of cement clinker cargoes.

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