Overview
Stage | Production |
Mine Type | Underground |
Commodities |
|
Mining Method |
- Longhole open stoping
- Cemented paste backfill
- Cemented (undefined) backfill
- Unconsolidated hydraulic fill
|
Production Start | ... |
Mine Life | 2050 |
The Caijiaying Mine is an operating zinc, gold, silver, and lead mine, together with processing plant, camp and supporting facilities.
2022 was one of the most disrupted and challenging years in the history of the Group with ongoing Covid-19 pandemic issues and 143 days of lost production due to restrictions imposed by the PRC authorities during the Winter and Paralympic Olympics and the Chinese Communist Party 20th National Congress. |
Source:
p. 7
Company | Interest | Ownership |
Zhangjiakou Yuanrun Enterprise Management Consulting Service
|
11.2 %
|
Indirect
|
Griffin Mining Ltd.
|
88.8 %
|
Indirect
|
The major asset of the Griffin Mining Limited is an 88.8% interest in Hebei Hua Ao Mining Industry Company Limited (“Hebei Hua Ao”) through its wholly-owned Hong Kong subidiary, China Zinc Limited. Griffin now holds an 88.8% equity interest in Hebei Hua Ao and Zhangjiakou Yuanrun Enterprise Management Consulting Service Co.retains an 11.2%.
Contractors
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Summary:
The Caijiaying Mine is located at the northern margin of the North China Craton in the Yanshan Metallogenic Belt within Hebei Province of the PRC. This prolific metallogenic belt trends east-west for hundreds of kilometres and contains numerous large mineral deposits of various types making the Yanshan one of the most economic regions in northern China. The local geology at the Caijiaying Mine comprises of early Proterozoic granulite and gneiss with marble lenses, which is unconformably overlain by the late Jurassic Baiqi Formation and Zhangjiakou Formation. Porphyry sills and dykes intruding along faults have then cut across the sequence. Mineralisation is believed to be related to a Jurassic igneous event that altered the 2.3 billion-year-old metamorphic basement rocks.
The Caijiaying Mine hosts base metal and gold mineralisation consistent with that of a replacement skarn type deposit. Lithologies comprise a mixed sequence of amphibolite-grade metavolcanic and metasedimentary rocks intruded by three generations of Jurassic porphyry dikes and sills that crosscut the mineralisation. The mineralisation commonly occurs as sulphide lenses of sphalerite with lesser pyrite and minor galena that favourably replace calc silicate and iron enriched amphibolite units within the folded metamorphic volcanic basement rocks. The Caijiaying Mine orebodies of Zn-Au-Ag-Pb are up to 20 m thick, tend to dip steeply to moderately to the west, and extend along strike and down dip tens ........
Mining Methods
- Longhole open stoping
- Cemented paste backfill
- Cemented (undefined) backfill
- Unconsolidated hydraulic fill
Summary:
The Caijiaying Mine is an operating zinc, gold, silver and lead mine.
Numerous upgrades to the Caijiaying Mine have taken place since commissioning leading to the current name plate mill throughput capacity of 1.5 million tonnes of ore per annum. Mining rates solely from Zone III have recently reached the equivalent of 1.5 million tonnes of ore per annum. The development of Zone II at the Caijiaying Mine, now being undertaken, will enable current and possibly higher production rates in the future.
With the grant of a new mining licence in December 2020 over the combined Zone II and Zone III areas, application was subsequently made for the approval of a mine design for the new Zone II area. This was granted in March 2023 and has enabled development at Zone II to commence. This will allow sustained production of at least 1.5 million tonnes of ore per annum to be extracted from the Caijiaying Mine until 2050, if not longer.
Zone III, which has been the primary source of ore since the Caijiaying Mine was commissioned in 2005, continues underground production down to the 1000RL (1,000 metres above mean sea level) mining licence boundary.
Long hole open stoping continues to be the predominant mining method. Underground development work was primarily focused on developing future stoping horizons between the 1175 mRL and 1000 mRL levels.
The installation and extension of the paste pipe reticulation system continues in order to ........
Source:
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Source:
Summary:
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Reserves at December 31, 2022:
The Caijiaying Mine’s Global Mineral Resource estimate comprises Zones II, III, V and VIII at a zinc cut-off grade of 1% as, amended for mining depletion at Zone III at 31 December 2022.
Category | Tonnage | Commodity | Grade | Contained Metal |
Indicated
|
12.7 Mt
|
Zinc
|
4.5 %
|
833 kt
|
Indicated
|
12.7 Mt
|
Lead
|
0.2 %
|
42 kt
|
Indicated
|
12.7 Mt
|
Silver
|
23 g/t
|
13,511 koz
|
Indicated
|
12.7 Mt
|
Gold
|
0.6 g/t
|
363 koz
|
Inferred
|
55.4 Mt
|
Zinc
|
3.6 %
|
1,983 kt
|
Inferred
|
55.4 Mt
|
Lead
|
0.8 %
|
420 kt
|
Inferred
|
55.4 Mt
|
Silver
|
31 g/t
|
55,245 koz
|
Inferred
|
55.4 Mt
|
Gold
|
0.5 g/t
|
862 koz
|
Total Resource
|
99.7 Mt
|
Zinc
|
3.8 %
|
3,815 kt
|
Total Resource
|
99.7 Mt
|
Lead
|
0.6 %
|
598 kt
|
Total Resource
|
99.7 Mt
|
Silver
|
27.2 g/t
|
87,085 koz
|
Total Resource
|
99.7 Mt
|
Gold
|
0.5 g/t
|
1,543 koz
|
HME Type | Size | Quantity | Leased or Contractor | Ref. Date | Source |
Drill
|
|
.......................
|
|
Dec 31, 2021
|
p.14
|
Drill
|
|
.......................
|
|
Dec 31, 2021
|
p.14
|
Drill jumbo (single boom)
|
|
.......................
|
|
Dec 31, 2017
|
p.4, 15
|
Drill jumbo (single boom)
|
|
.......................
|
|
Dec 31, 2021
|
p.14
|
Drill jumbo (two boom)
|
|
.......................
|
|
Dec 31, 2018
|
p.4
|
Loader
|
|
.......................
|
|
Dec 31, 2017
|
p.4
|
Load-Haul-Dump (LHD)
|
|
.......................
|
|
Dec 31, 2021
|
p.14
|
Rock bolter
|
|
.......................
|
|
Dec 31, 2017
|
p.4
|
Truck (haul)
|
20 t
|
.......................
|
|
Dec 31, 2020
|
p.17
|
Truck (haul)
|
20 t
|
.......................
|
|
Dec 31, 2021
|
p.14
|
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