We are the pioneers in core drilling in Sri Lanka. The GSMB offers specialized services in drilling for mineral exploration, mining, engineering geological(Geotechnical related works) work related to reservoirs, dams and tunnels, foundation testing etc. We assure collecting of soil and core samples with 90% recovery according to the ASTM and BS standards.
| Drilling | Type | Aim | Maximum drilling depth |
| Auguring | Hand auguring | Loose disturbed soil sampling for mineral surveys, foundation tests etc. | 15m |
| Power auguring | Disturbed soil sampling specially for mineral exploration in overburden | 30m |
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| Rotary core drilling in overburden | SPT tests, Undisturbed sampling | 50m | |
| Diamond core drilling(Conventional, wireline, and top driven) |
HW, NX ,NXM,BX,BXM,AX,AXM sizes HQ,NQ,BQ sizes |
Collecting very accurate drill core samples for mineral exploration and for foundation investigations |
100m 300m 500m |
The deepest core drill hole was into shale beds of Jurassic age at Andigama area in Puttalam district – about 450 m. Presently, we are capable to drill even deeper.
The following are some of the landmark events of our drilling history.
Mineral Exploration
- Seruwila (Copper & Iron)
- Panirendawa,Wilagedera(iron ore)
- Aruwakkalu (Limestone)
- Eppawala (Phosphate)
- Andigama, Pallegama
- Tabbowa ( shale)
- Dutch Bay, Aruakkalu, (Limestone)
- Cement raw material survey in Pooneryn, Mankulam and Murunkan.
Engineering geological investigations
- Gin ganga –Nilwala ganga tunnel trace
- North central diversion tunnel trace under Moragahakanda project
- Moragahakanda dam
- Kukule ganga
- Samanala wewa
- Upper Kotmale(dam spillway tunnel etc.)
- Foundation investigations for numerous multi-story buildings wind power plants etc.
Hand and Power auguring at
- Dediyawala, Meetiyagoda, Piliyandala, for ball clay and kaolin
- Nattandiya and Madampe areas for silica sand
Power auguring
Geochemical survey(Badulla), sand surveys(Ambalantota)
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· Hand and Power auguring at;