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China
Songjiagou North Mine (Songjiagou Operation)

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 Location:
37 S from Yantai, China

  Address:
Qiansongjiao Village, Wanggezhuang Town, Muping District
Yantai City, Shandong Province
China
264106
WebsiteWeb
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  • Geology
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Blast Hole Stoping
  • Shrinkage stoping
  • Backfill
Production Start...


Owners

Source: p. 4
CompanyInterestOwnership
Yantai Dahedong Processing Co. Ltd. (operator) 25 % Indirect
Majestic Gold Corp. 75 % Indirect
Majestic holds its 75% interest in SJG Project through its 94% owned subsidiary SINOGOLD Resources Holdings Group Co. Ltd. (“SINOGOLD”) indirectly. The remaining 25% of SJG Project is held by Yantai Dahedong Processing Co. Ltd.

Contractors

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Deposit Type

  • Breccia pipe / Stockwork
  • Vein / narrow vein
  • Mesothermal


Summary:

Majestic’s mining licenses are located in proximity to three major northeast-southwest trending faults and are underlain by both Archean and Proterozoic basement and granite intrusions reminiscent of some of the world’s largest gold producing camps. The deposits of the Jiaodong Peninsula form one of the largest provinces of granitoid-hosted lode-gold deposits in the world and host some of China’s largest gold producers.

Gold occurrences on the Jiaodong Peninsula are of vein-type as well as disseminated and stockwork styles. The veins typically occur within second and third-order faults cutting Mesozoic granitoids and are relatively continuous, measuring from a few centimeters to several meters in thickness by as much as five kilometers in strike. The stockworks occur along regional faults and are surrounded by broad alteration halos. The vein type mineralization is described as mesothermal; the disseminated and stockwork style have some aspects of epithermal mineralization but are both spatially and genetically associated with the vein-type mineralization. The Songjiagou gold mine is a moderate temperature hydrothermal filling and metasomatic conglomerate type gold deposit with no clear boundary between wall rocks and ore. As a result, assay analysis is required to determine ore grades before mining is undertaken.


Mining Methods

  • Blast Hole Stoping
  • Shrinkage stoping
  • Backfill


Summary:

The Songjiagou underground mine is situated approximately 405 metres northeast of the Company’s existing open pit operation. The formed concrete portal entrance provides access to a spiral ramp whose dimensions are 4.5 × 4.0 metres at a slope gradient ranging from 10-15% with the exception of curved portions which are slopped at 5% for safety reasons.

The ramp is sized to facilitate the use of trackless mining equipment including ore haulage to the surface process plant. The ramp was collared at an elevation of 80 meters a.s.l (above sea level) and is designed to achieve a total length of 2,075 meters in the first phase of development.

Underground mining operations are highly mechanized and include high efficiency, rapid- penetrating, hydraulic jumbo drills for development work, rotary drilling equipment employing extension steel for inclined medium and longer holes, 20 tonne dump trucks for ore haulage to surface via the ramp, and electric scrapers to facilitate ore recovery and loading in work areas.

The Company employs a mix of mining methods which are based on mining and geological conditions that are expected to be quite variable. Where warranted by ground conditions, mined out areas will be backfilled with tailings which - in addition to providing good ground support - reduces output into the surface tailings disposal area.

Ore blocks are typically 50-60 metres in length, with the thickness of the ore blocks determined by mini ........


Crushing and Grinding
Flow Sheet: Source

Primary Crushing
Haul trucks deliver the mining inventory from the open pit to the primary crushing workshop for grid screening, the underflow of which is sent to the mining inventory bin. Inventory with particle sizes less than 500 mm are fed to the jaw crusher by a heavy apron feeder, and the jaw crusher’s discharge is subjected to secondary crushing.

Secondary/Tertiary Crushing
A vibrating feeder feeds the primary crushing product to the cone crusher for secondary crushing. The crusher’s discharge is delivered to the vibrating screen for classification.

The screen oversize is conveyed to the cone crusher for tertiary crushing, and its discharge is conveyed back to the vibrating screen for classification. Particles passing the screen (-20 mm) are sent to the fine ore bin.

Grinding
The fine ore (-20 mm) is conveyed by the belt feeders to the ball mills. Each ball mill and its respective spiral classifier form a closed circuit for grinding. Ball mill discharge is classified by a spiral classifier. The continuously revolving spirals carry the settled sands up and discharge the sands into the mill feed chute. Overflow from the classifier flows to the flotation conditioning tank.


Processing

Flow Sheet: Subscription required

Summary:

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Production:

CommodityUnits2021202020192018
Gold oz  ......  Subscription required  ......  Subscription required  ......  Subscription required317
All production numbers are expressed as metal in concentrate.
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Operational Metrics:

Metrics2021202020192018
Ore tonnes mined  ......  Subscription required  ......  Subscription required90,112 t3,937 t
Tonnes milled  ......  Subscription required  ......  Subscription required90,112 t3,937 t
Daily ore mining rate  ......  Subscription required  ......  Subscription required240 t
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Reserves at January 19, 2016:
Cut-off 0.80 g/t Au

CategoryTonnage CommodityGrade
Inferred 5.6 Mt Gold 2.6 g/t



Heavy Mobile Equipment:

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Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Management Discussion & Analysis 2018
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