scholarly journals Early cretaceous deposits in the Gays River lead-zinc mine, Nova Scotia

1984 ◽  
Author(s):  
E H Davies ◽  
S O Akande ◽  
M Zentilli
Keyword(s):  
Nova Scotia ◽  
Early Cretaceous ◽  
Lead Zinc ◽  
Zinc Mine ◽  
Cretaceous Deposits

Cretaceous Deposits in the Musquodoboit River Valley Nova Scotia

1971 ◽  
Vol 8 (9) ◽  
pp. 1152-1154 ◽  
Author(s):  
Chang L. Lin
Keyword(s):  
Nova Scotia ◽  
Early Cretaceous ◽  
Drainage System ◽  
River Valley ◽  
Tributary Stream ◽  
Available Information ◽  
Cretaceous Deposits

Two carbonaceous samples recovered from pre-Pleistocene unconsolidated deposits in a borehole at Elmsvale, Musquodoboit River Valley, Nova Scotia, were dated as Early Cretaceous in age. The thickness of the deposit encountered was 551 ft (168 m). Available information suggests that the upper segment of the present Musquodoboit River was a tributary-stream of the Shubenacadie drainage system.

scholarly journals Rational size and stability analysis of horizontal isolated pillars in deep mining from caving to filling method

2021 ◽  
Vol 303 ◽  
pp. 01040
Author(s):  
Fan Feng ◽  
Xibing Li ◽  
Shaojie Chen ◽  
Dingxiao Peng ◽  
Zhuang Bian
Keyword(s):  
Numerical Simulation ◽  
Three Dimensional ◽  
Mining Area ◽  
Middle Section ◽  
Deep Mining ◽  
Metal Mines ◽  
Lead Zinc ◽  
Filling Method ◽  
Zinc Mine ◽  
Cut And Fill

For mining using the caving and filling methods in metal mines, determining a suitable size for the isolated pillars—the connecting part of the extension from shallow to deep—is crucial for ensuring safety and efficiency. Considering actual cases involving deep caving and cut-and-fill mining in the Chifeng Hongling lead-zinc mine in Inner Mongolia, China, the reserved thickness range of the horizontal isolation layer is obtained via theoretical analysis. On this basis, the pre-processing software HyperMesh is used to build a high-precision hexahedral grid model of the mining area, and the three-dimensional geological model of the mining area is imported into the finite-difference software FLAC3D. The stress field, displacement field, and plastic area evolution law of pillars (horizontally isolated pillars and adjacent rib pillars) in the stope of the ninth middle section after excavation are analyzed via numerical simulation inversion of the selected scheme of horizontal isolated pillars. The numerical simulation results show that the scheme employed to retain the upper horizontal isolated pillars in the ninth middle section involves reserving thicknesses of 8 m and 32 m at average ore body thicknesses of 15 m and 35 m, respectively. These results can provide theoretical guidance and a basis for safe and efficient mining of deep metal mines.

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