Development of Design Procedures for Long Slender Pillars
Design guidance for rib pillars, built from back analysed in situ coal tests and two dimensional modelling rather than empirical data, for rock engineers laying out high extraction panels.
by DP Roberts, JA Ryder & JN van der Merwe | March 2005
Numerical modelling produced upper and lower bound strength formulae for rib pillars, the lower bound covering weak roof and floor contacts. The formulae apply between width to height ratios of 0.5 and 2.5, with linear interpolation below that, and give conservative designs above 3. Adjustments were suggested where regular joint sets occur.
R1500,00
Description
Related Products
An Environmental Management Accounting Model for the South African Mining Industry
2008
Doctoral work comparing environmental cost practice at four South African mines and building a model from it, for environmental managers and finance staff in mining companies.
What this report foundConventional cost accounting at the mines studied could not report on physical structure or materials flow, so environmental costs such as water, energy and...
R1500,00
Conventional cost accounting at the mines studied could not report on physical structure or materials flow, so environmental costs such as water, energy and consumables stayed hidden and chances to cut them were lost. Four case studies across different commodities and mining methods showed the same limitations. An environmental management accounting model is proposed to identify and allocate those costs.
Final Report – A feasibility study on a regenerative integrated cropping & livestock business case model as a mine closure tool and post-closure land use for differently rehabilitated land capability classes
2025
Feasibility study on a regenerative integrated cropping & livestock business case model as a mine closure tool and post-closure land use for differently rehabilitated land capability classes Enterprises University of Pretoria
R1500,00
Transformation of the Coal Mining Procurement Supply Chain
2004
Review of preferential procurement and small supplier development at South African coal producers, based on interviews with procurement staff, suppliers and accreditation agencies, with recommendations for management.
What this report foundThree modes of intervention were found in coal company procurement: preferential procurement rules, segmentation of goods and services by suitability for...
R1500,00
Three modes of intervention were found in coal company procurement: preferential procurement rules, segmentation of goods and services by suitability for transformation, and support programmes for small suppliers. Progress stalled where supplier development was handled by staff carrying other duties, since work not tied to production loses time and has no target. The remedy proposed is procurement targets linked down through commercial and production management.
R1500,00