قبل البدء بعمليات التعدين لا يد من عمل الدراسات التى تشمل
4- geotechnical work
5- the folowing study
There are three levels of engineering studies during development from exploration through development and production, namely – conceptual, pre-
feasibility and feasibility
A. Conceptual Study
This refers to scoping study which is the first level and preliminary evaluation of any mining project. The accuracy will be low at + 50% and the drilling and sampling must be sufficient to define resource, flowchart, cost estimation and production schedule.
This phase should clarify the following:
- Technical parameters requiring additional examination or test work.
- Capital and operating cost estimate.
In this stage the result is not sufficient for reserve due to lower accuracy.
- Level of project development
B. Pre-Feasibility Study
This is the second state which is based on some engineering basis at + 25% accuracy higher than scoping study.
The objective to determine the following parameters:
In this stage, geology and mine engineering work has been conducted to define resource and reserve. Also sufficient test work has been completed and developed mining plant.
- Economic analysis and sensitivity
C. Feasibility Study
This stage is the last and most detailed stage in engineering process for evaluating a mining project for go/no go decision and financing purposes. This stage is based on the following:
· Complete engineering and test work.
· Accuracy is higher than pre-feasibility study - + 15%.
· Detailed geological and mine engineering to define resource and reserve.
· Completed all mining and processing parameters for pit slope design, hydrology, geotechnical, flow sheet development, hydrology, geotechnical, flow chart, equipment selection and sizing, etc.
· Capital and operating cost estimates are derived from take-off and vendor quotes.
· Economic analysis with sensitivities based on cash flow for the mine.