Project description
We manage a working sand quarry and are looking for a contractor to carry out a standing monthly mine survey. The active extraction area is about eleven hectares, worked in three benches of six to eight metres each, with haul ramps along the northern side of the pit. Every month we need the upper and lower crests and the toes of all benches picked up, together with the pit floor, the ramps and the current boundary of disturbed ground, so that the volume of rock taken out between two consecutive surveys can be calculated and put on paper.
The second half of the job is the stockyard. We keep between six and nine piles of washed and unwashed sand of different fractions; they are conical and prismatic, the loader reshapes them daily, and their volumes must be tied to one stable base surface so that the figures stay comparable from month to month. The volume difference between surveys is then compared with the weighbridge tickets and the shipping records, and we expect the difference to be explained rather than smoothed over: bulking, moisture, losses in haulage, the density coefficient applied.
This is a legally operating enterprise with a valid extraction permit, and the contractor must hold the right to perform mine surveying work. Site safety rules apply to everyone: hard hat, high-visibility vest, induction briefing, and each survey day agreed in advance with the mine surveying and geological supervision service of the enterprise. Instrument stations are allowed only at a safe distance from the bench edge, never under an active face and never on an undermined crest. This is not a garden plot topographic survey, and the accuracy we need is the accuracy that survives an audit.
What the report must contain:
— a plan of the pit with benches, crests, toes and the current boundary of works;
— a statement of volumes: extracted during the period, remaining in the block, stockpiles by fraction;
— a comparison with shipment figures and a written note on any discrepancy;
— a statement of the accuracy achieved and what it depends on: point density, survey method, pile surface roughness, weather on the day;
— data files in common exchange formats plus a signed paper copy.
First survey within ten days of signing, then in the last week of every month.
The second half of the job is the stockyard. We keep between six and nine piles of washed and unwashed sand of different fractions; they are conical and prismatic, the loader reshapes them daily, and their volumes must be tied to one stable base surface so that the figures stay comparable from month to month. The volume difference between surveys is then compared with the weighbridge tickets and the shipping records, and we expect the difference to be explained rather than smoothed over: bulking, moisture, losses in haulage, the density coefficient applied.
This is a legally operating enterprise with a valid extraction permit, and the contractor must hold the right to perform mine surveying work. Site safety rules apply to everyone: hard hat, high-visibility vest, induction briefing, and each survey day agreed in advance with the mine surveying and geological supervision service of the enterprise. Instrument stations are allowed only at a safe distance from the bench edge, never under an active face and never on an undermined crest. This is not a garden plot topographic survey, and the accuracy we need is the accuracy that survives an audit.
What the report must contain:
— a plan of the pit with benches, crests, toes and the current boundary of works;
— a statement of volumes: extracted during the period, remaining in the block, stockpiles by fraction;
— a comparison with shipment figures and a written note on any discrepancy;
— a statement of the accuracy achieved and what it depends on: point density, survey method, pile surface roughness, weather on the day;
— data files in common exchange formats plus a signed paper copy.
First survey within ten days of signing, then in the last week of every month.
Photography Cash, Bank transfer
