Question: Which mine is older, the Burwash Mine or the Con Mine?

Context articles: Evergreen Cemetery (Juneau, Alaska)
Negus Mine
Mount Prindle
Make Mine Laughs
Just a Friend of Mine
Mía (Armando Manzanero song)
The Burden Is Mine... Alone
Burwash Mine
Con Mine
The Burgies

Evergreen Cemetery is a cemetery in Juneau, the capital of the U.S. state of Alaska.
 It was established in 1887 to replace the older cemetery on Chicken Ridge, near Main Street, when that location was staked as a gold mine.
 Most of the graves in this older cemetery were moved to the new cemetery between 1889 and 1892 and the rest were moved about 1915.
 The grounds were deeded by Evergreen Cemetery Association to the City of Juneau on May 23, 1907.
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.
Mount Prindle is a granitic mountain in the Yukon-Tanana Uplands, and is located approximately 45 mi north-northeast of Fairbanks, Alaska.
 The plutons that form the core of the Mount Prindle massif are Late Cretaceous or early Tertiary age.
 These plutons intruded older (Precambrian to Paleozoic) metamorphic rocks. Mount Prindle exhibits classic glacial landforms, unlike most of the surrounding Yukon-Tanana Uplands.
 It is in the Circle Mining District and many of the surrounding creeks have been or are being mined for placer gold.
 The area has also been prospected for tin and rare earth minerals.
 Mine roads and hiking trails provide access to the mountain.
 A 900 ft granite wall on an eastern spur of the massif is an attraction for rock climbers.
Make Mine Laughs is a 1949 film directed by Richard Fleischer.
 The film was a compilation of comic scenes and musical numbers from older and newer RKO Studios films.
"Just a Friend of Mine" is the first single by the Belgian band Vaya Con Dios.
 It was released in 1987 by Ariola Records and later included in the band's debut album "Vaya Con Dios".
"Mía" ("Mine") is a song by Mexican songwriter Armando Manzanero included in the album " A Mi Amor Con Mi Amor" (1967).
 It was first released as a double-side single along with the track "Felicidad" in 1969.
The Burden Is Mine... Alone is an EP by the Norwegian progressive metal band Green Carnation, released in October, 2005 by Profound Lore Records.
 The EP would be an indicator of the stylistic shift the band planned for their next album, "The Acoustic Verses".
 The EP and following album are very different from the usual dark mood that the band's older releases have.
 This all out acoustic release has a lighter tone, and is a larger stylistic shift for the band.
 The EP also contains two tracks that were not included in the 2006 album, "The Acoustic Verses".
The Burwash Mine was a small gold property discovered in the fall of 1934 by Johnny Baker and Hugh Muir at Yellowknife Bay, Northwest Territories.
 The town of Yellowknife did not exist yet at that point, but the discovery of gold at Burwash was the catalyst that brought more gold prospectors into the region in 1935 and 1936.
 A short shaft was sunk in 1935-1936 at Burwash, and in the summer of 1935 a 16-ton bulk sample of ore was shipped to Trail, British Columbia for processing, yielding 200 troy ounces (6 kg) of gold.
 The mine did not become a substantial producer and it is believed the gold vein was mined out.
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.
The Burgies (or Burgy Bank) are a set of two slag heaps located in the Laffak area of St Helens, Merseyside.
 The two are divided by Islands Brow road and Snookerpool Avenue and are bordered on the west side by the rail line connecting Liverpool Lime Street with Wigan North Western.
 They are on the site of the old Rushy Park coal mine noted as the first mine to use the revolutionary Anderton shearer-loader.
 The slag heaps were created by the dumping of toxic chemical waste from the manufacture of glass by the towns Pilkington company.
 The exact composition of the slag heaps is unknown but a land study showed it to contain various poisonous elements such as Arsenic, Lead and Cadmium.
 Technically the land is private property belonging to Pilkington but the public have access and regularly use it for various activities.
 The exact age of the Burgies is unknown, however it is understood that the second burgies is actually the oldest.
 This older one is sometimes referred to as "the dry Burgies" with the newer first burgies referred to as "the wet Burgies".
 These terms are used by older residents who remember the actual construction, as the first one is a drier waste with the second one being a thick liquid.
 This liquid was pumped through a pipe from Pilkington’s across the second Burgies to the site of the first Burgies.
 Boards were erected as moulds to hold the liquid until it dried and then moulds were built on top of these to allow more liquid to be placed on top.