Question: Which mine started production sooner, the Con Mine, or the Giant Mine?

Context paragraphs:
Chain Valley Colliery: Chain Valley Colliery is a coal mine located at Mannering Park, New South Wales, Australia.  The colliery was developed to provide coal for the Vales Point Power Station, adjacent to the mine.  The mine started in August 1960, with coal production commencing in 1961.  The Great Northern and Fassifern coal seams have been mined using bord and pillar mining methods.  Coal is transported to the Vales Power Station by an overland conveyor system, while excess coal is trucked to domestic customers and also to the Port of Newcastle for export.

N.W.T. Mining Heritage Society: The N.W.T. Mining Heritage Society, in the Northwest Territories, Canada, was first formed in early 2000 as the Giant Mine Heritage Group to rescue items from the Giant Mine site after its owner, Royal Oak Mines Incorporated, went bankrupt.

Con Mine: The Con Mine (1938-2003) was the first gold mine developed in the Northwest Territories, Canada, just south of Yellowknife.  The property was staked by Consolidated Mining and Smelting Company of Canada (Cominco) in September 1935 in response to the discovery of visible gold nearby; the name "Con" is an abbreviation of "Consolidated".  The advent of winter prevented any prospecting from being conducted, but work in the summer of 1936 led to the discovery of numerous gold veins.  The Con Mine entered production in 1938 and ceased operations in 2003.  It has produced over 5000000 ozt of gold from 12,195,585 tons of ore processed.  The mine was over 6000 ft deep.

Giant Mine (film): Giant Mine is a Canadian television film, which dramatizes the events of the 1992 Giant Mine labour dispute and the subsequent bomb explosion which killed nine replacement workers.  The film, written by John Hunter and Martin O'Malley and directed by Penelope Buitenhuis, aired on CBC Television in 1996.

Franklin-Creighton Mine: The Franklin-Creighton Mine was a Georgia Gold Rush gold mine located off what is now Yellow Creek Road in the town of Ball Ground in Cherokee County, Georgia.  The mine, located along the Etowah River, was initially known as the Franklin Mine because it was started by a widow, Mrs. Mary G. Franklin, who obtained a 40 acre lot in the Gold Lottery of 1832.  Around 1883, the mine became known as the Creighton Mine or the Franklin-Creighton Mine.  This mine was one of the most productive and continued to operate many years after other area mines had ceased operations.  Some estimate that it was yielding $1000 per day in 1893 and others place its total production after 1880 at as much as $1,000,000.  The mine was shut down in 1913 as a result of a collapsed shaft which caused the mine to flood.

Ptarmigan and Tom Mine: The Ptarmigan and Tom Mine were gold producers located in the Northwest Territories, Canada at Yellowknife.  The property was staked by prospectors in 1936 and acquired by Cominco in 1938.  The mine first produced between 1941 and 1942 but closed due to wartime restrictions.  The old property was demolished in 1969–1970.  A new company, Treminco Resources Limited, reopened the workings in 1985 and production from the Tom ( ) portal began in 1986 with material being trucked to Giant Mine.  The old Ptarmigan ( ) mine shaft was dewatered and production began in 1987.  A new mill was built at the property and was operational in July 1989.  Low gold prices forced the company to close the mines in 1997.  Total gold production has been approximately 120,000 troy ounces (3700 kg).

Westside Mine: Westside Mine is a coal mine located at Wakefield, New South Wales, Australia.  The open cut mine was developed to provide coal for the Eraring Power Station.  The mine started in 1992.  The mine is proposed to be closed in 2012.

Gregory coal mine: The Gregory Coal Mine is an open-cut coal mine located 60 km north east of Emerald in the Central Queensland, Australia.  The mine has coal reserves amounting to 159 million tonnes of coking coal, one of the largest coal reserves in Asia and the world.  The Bowen Basin mine has an annual production capacity of 5 million tonnes of coal.  Operations at the Gregory mine started in 1979.  Coal from the mine is exported to the Port of Gladstone via the Blackwater railway system.

Negus Mine: Negus Mine was a gold producer at Yellowknife, Northwest Territories, Canada, from 1939 to 1952.  It produced 255,807 troy ounces (7956 kg) of gold from 490,808 tons of ore milled.  The underground workings were acquired by adjacent Con Mine in 1953 and were used for ventilation purposes until Con Mine closed in 2003.

Giant Mine: The Giant Mine was a gold mine located on the Ingraham Trail, 5 km north of Yellowknife, Northwest Territories.  Giant Mine is within the Kam Group, which is part of the Yellowknife greenstone belt.  Gold was discovered on the property and mineral claims staked in 1935 by Johnny Baker, but the true extent of the gold deposits were not known until 1944 when a massive gold-bearing shear zone was uncovered beneath the drift-filled Baker Creek Valley.

Supporting paragraphs: Con Mine Giant Mine
Answer: The Con Mine