On January 1, 2024, in connection with the Steelmaking Coal Business Unit Transactions Teck Resources completed an internal reorganization of the steelmaking coal business unit to align all steelmaking coal assets, including Teck Coal Partnership and Elkview Mining Limited Partnership, under a newly organized Elk Valley Mining Limited Partnership (EVM LP), which directly or indirectly holds 100% of steelmaking coal assets.
On January 3, 2024, Teck completed the NSC and POSCO Transactions, with NSC and POSCO acquiring a 20% and 3% interest, respectively, in EVM LP. Following the NSC and POSCO Transactions, EVM LP now holds a 100% interest in all of the steelmaking coal operations and Teck holds a 77% interest in EVM LP, with NSC and POSCO holding the remaining 20% and 3%, respectively.
On July 11, 2024, Teck Resources Limited completed the sale of its remaining 77% interest in the steelmaking coal business to Glencore plc.
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Summary:
GHO is located within the Elk Valley Coalfields. The coal measures are situated within the Upper Jurassic to Lower Cretaceous Kootenay Group sediments.
From earliest to latest, the Kootenay Group includes:
• Morrissey Formation: sandstones; subdivided into the Weary Ridge and Moose Mountain Members; 20–80 m in thickness;
• Mist Mountain Formation: interbedded sandstone, siltstone, mudstone, shale and thin to thick seams of bituminous to semi-anthracite coal; 450–550 m in thickness;
• Elk Formation: interbedded sandstone, siltstone, mudstone, shale and locally thick beds of chert-pebble conglomerate and thin seams of high volatile bituminous coal; 350–450 m in thickness.
The Mist Mountain Formation contains approximately 25 coal seams of potential economic interest, consisting of medium to high volatile bituminous coal.
Within the coal measures, there are three structurally-separated coalfields, the Elk Valley, Crowsnest, and Flathead coalfields. The Elk Valley coalfield is located within the Alexander Creek and Greenhills synclines, which are separated by a normal fault. The western edge of the Mist Mountain Formation, and therefore the distribution of the Elk Valley coalfield, is controlled by the Bourgeau Fault. To the east of this fault, the Greenhills syncline plunges to the north, and its eastern limb is truncated by the north-trending normal Erickson fault. East of the Erickson fault is the Alexander Creek syncline, which is in turn cut by the Ewin Pass thrust fault (Ryan, 2001).
The coal seams in both synclines are typically fragmented and sheared. Thicker seams are generally lower in the section, tend to host major thrusts, and therefore are frequently extensively sheared (Ryan, 2001).
Greenhills Syncline
The east limb of the asymmetric Greenhills syncline dips westerly at 15–25°, except in areas near the Erickson Fault, where 45–55° dips are common. The west limb exhibits much steeper dips, commonly in the 32–45° range. The Greenhills Syncline plunges northward (340–350°), at less than 5°, and then thins out and seems to end to the north in the area of the Osborne Creek Depression (Lake Mountain) (Mills et al., 2020).
Erickson Fault
The Erickson Fault, which locally runs along the base of the Greenhills Range, west of the Fording River, is one of the major regional faults. From south to north, this westerly dipping (40–70°) normal fault brings Mist Mountain strata progressively into contact with Rundle, Rock Mountain, Spray River, Fernie and Morrissey strata. The downthrown block is to the west.
Near the south end of Lake Mountain, the Erickson Faults begins to “splay” into two zones. The main fault runs along the eastern margin of Lake Mountain, and the subsidiary fault runs to the west and appears to thin out and end northward. The steep northward dip exhibited in the Lake Mountain strata could be due to influence from these flanking “splays” of the fault. The flat-lying region to the north of Lake Mountain (Osborne Creek Depression area) is completely void of out-crop, and the Erickson Fault has not been traced either through or to the north of this area (Mills et al., 2020).
Mineralization
The Mist Mountain Formation depth of burial ranges from surface exposures to greater than 1,500 m. The coal measures on the GHO property contain bituminous grade coal seams with varying volatile matter contents. The coal quality varies with depth of burial and location along the strike of the deposit. Seams may range in thickness from 1–16 m.
At Greenhills, up to 24 coal seams occur in the Jurassic-Cretaceous Mist Mountain Formation (Kootenay Group) interbedded with sandstone, siltstone and shale. The major seams, which are continuous throughout the area, are named 1, 7, 10, 16 and 20. Seams 1, 7 and 10 (68 per cent of in place geological reserves) are medium volatile bituminous coal, while seam 16 and other stratigraphically higher seams are high volatile A bituminous in rank. Other major seams are lenticular and less extensive (several kilometres extent) and occur generally in the upper half of the Mist Mountain Formation. Thicknesses of the major seams are as follows from oldest to youngest; seam 1 (10 to 16 metres), 7 (7 to 11 metres), 10 and 10L (5 to 11 metres), 16 and 16L (5 to 11 metres, and seam 20 (2 to 7 metres).
GHO produces the following coal products:
• Hard coking coal (HCC): coke strength after reaction (CSR) 64+;
• Semi-hard coking coal (SHCC): =55 CSR =63.