Water-Rock Reactions in a Barite-Fluorite Underground Mine, Black Forest (Germany)

2002 ◽  
pp. 171-187 ◽  
Author(s):  
Ingrid Stober ◽  
Yinian Zhu ◽  
Kurt Bucher
Keyword(s):  
Underground Mine ◽  
Black Forest

Simulated processes using the simulation system of the underground mine logistics system

2019 ◽  
Vol 7 (24) ◽  
pp. 15-19
Author(s):  
O.Yu. Kozlov ◽  
◽  
V.V. Kozlov ◽  
V.V. Agafonov ◽  
◽  
...  
Keyword(s):  
Simulation System ◽  
Underground Mine ◽  
Logistics System

Functional limitations and requirements for the simulation model of the underground mine logistics system

2019 ◽  
Vol 7 (24) ◽  
pp. 20-24
Author(s):  
O.Yu. Kozlov ◽  
◽  
V.V. Kozlov ◽  
V.V. Agafonov ◽  
◽  
...  
Keyword(s):  
Simulation Model ◽  
Functional Limitations ◽  
Underground Mine ◽  
Logistics System

Underground mine planning with regard to preparedness of mineral reserves

2019 ◽  
Vol 5 ◽  
pp. 34-43 ◽  
Author(s):  
T. Kalybekov ◽  
◽  
K.B. Rysbekov ◽  
A.A. Toktarov ◽  
O.M. Otarbaev ◽  
...  
Keyword(s):  
Underground Mine ◽  
Mine Planning ◽  
Mineral Reserves

Mit Initialfemeln zum Plenterwald (Essay) | The creation of selection forest using initial femel cut (essay)

2009 ◽  
Vol 160 (6) ◽  
pp. 137-143
Author(s):  
Rudi Kynast
Keyword(s):  
Mixed Forest ◽  
Point Of View ◽  
Age Group ◽  
Black Forest ◽  
Crown Height ◽  
Short Intervals ◽  
Total Growth ◽  
Cost Calculations ◽  
Selection Forest ◽  
Individual Trees

Although selection forests have clear advantages over age-group forests in view of their total growth performance, their net product and their stability, not to mention the sustainability of their beneficial effect, the proportion of this type of forest is insignificantly small in Germany and also in mixed forest in the mountains. It is therefore all the more surprising that scarcely any discernable efforts have been made to increase the proportion of selection forests. For a conversion, an alternative model for the treatment of the stands is adopted, whereby it is no longer the encouragement of the growth to maturity of individual trees in the stand which is aimed for, but rather the transformation of the whole stand to a selection forest using available stand elements and elements created by an early initiation of regeneration. Based on his experience in the forestry district of Kirchzarten in the Black Forest, Germany, the author describes the procedure for a successful conversion. This is to be started as soon as possible, that is to say when the crown height of the trees is about 18 metres and with corresponding usable dimensions, using small group shelter-wood cuts, a so-called initial femel cut. To get the conversion started it is advisable to remove whole groups of predominantly badly situated and overgrown trees. The stand will be additionally structured later through further interventions at short intervals. In the process, here and there really well situated trees will actually be left to stand solitar y, in other places w hol e self-cont aine d groups will b e created and else where valuabl e mixed s tand elements will be selected for permanent preservation, this in order to create a situation in which there are about 35 overstorey trees per hectare. On the basis of his own cost calculations, the author comes to the conclusion that the conversion is, from a financial point of view, superior compared with the age-group forest in that it brings higher proceeds more quickly and more often.

Spatial data model for underground mine 3D visual production management and control system

2013 ◽  
Vol 32 (2) ◽  
pp. 581-584
Author(s):  
Shu-min XIONG ◽  
Li-guan WANG ◽  
Zhong-qiang CHEN ◽  
Jian-hong CHEN
Keyword(s):  
Control System ◽  
Spatial Data ◽  
Data Model ◽  
Production Management ◽  
Underground Mine ◽  
And Control ◽  
Spatial Data Model

Pilot-scale neutralisation of underground mine water

1996 ◽  
Vol 34 (10) ◽  
pp. 141-149 ◽  
Author(s):  
J. P. Maree ◽  
G. J. van Tonder ◽  
P. Millard ◽  
T. C. Erasmus
Keyword(s):  
Mine Water ◽  
Contact Time ◽  
Pilot Scale ◽  
Underground Water ◽  
Underground Mine ◽  
Economic Feasibility ◽  
Fluidised Bed ◽  
Chemical Composition Of Water ◽  
Before And After ◽  
Time Required

Traditionally acid mine water is neutralised with lime (Ca(OH)2). Limestone (CaCO3) is a cheaper alternative for such applications. This paper describes an investigation aimed at demonstrating that underground mine water can be neutralised with limestone in a fluidised-bed. The contact time required between the limestone and the acid water, chemical composition of water before and after treatment, and economic feasibility of the fluidised bed neutralisation process are determined. A pilot plant with a capacity of 10k1/h was operated continuously underground in a gold mine. The underground water could be neutralised effectively using the limestone process. The pH of the water was increased from less than 3 to more than 7, the alkalinity of the treated water was greater than 120 mg/l (as CaCO3) and the contact time required between mine water and limestone was less than 10 min (the exact contact time depends on the limestone surface area). Chemical savings of 56.4% can be achieved compared to neutralisation with lime.

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