1. What is Diamond Core Drilling?

Diamond core drilling is a high-precision, core-preserving drilling method that uses diamond-impregnated drill bits to cut and sample rock formations. As the most authoritative and widely adopted technology for mineral exploration, geological survey, and engineering geological investigation, it delivers intact solid rock core samples for accurate stratum analysis, resource reserve calculation, and construction condition evaluation.

Different from impact drilling that crushes rock mass, diamond core drilling adopts rotary cutting with super-hard diamond bits. It features small disturbance to the borehole wall, complete core retention and accurate geological data, which is irreplaceable for metal mine exploration, deep stratum detection and high-standard engineering survey projects.

2. Working Principle of Diamond Core Drilling

Diamond core drilling relies on the high hardness and wear resistance of diamond particles on the bit. Driven by the full hydraulic drilling rig, the diamond bit rotates steadily and cuts rock strata layer by layer. With the protection of double-tube wireline coring system and circulating flushing fluid, the rock core enters the inner barrel completely without damage.

After completing single-section drilling, the core barrel is retrieved through wireline salvage without pulling out the entire drill string. After sampling inspection, the inner barrel is reset quickly to continue deep drilling. The whole process realizes continuous, stable and high-precision coring operation.

3. Core Advantages of Diamond Core Drilling

Complete & Accurate Core Samples: Diamond rotary cutting causes no crushing damage to rock core. The core integrity rate can reach over 98%, truly reflecting stratum structure, rock grade and mineral distribution, providing reliable data for mine resource assessment.

Adaptable to Complex & Deep Formations: It performs stably in hard rock, fractured strata, interbedded rock and deep-hole drilling projects. It perfectly adapts to high-demand exploration scenarios such as nickel, gold, copper and rare metal mines.

High Drilling Precision & Low Deviation: Smooth rotary cutting and stable hydraulic feeding effectively reduce borehole deviation, ensuring straight and regular boreholes, which meets the requirements of deep-hole long-distance geological exploration.

Low Ground Disturbance & Strong Safety: The cutting-type rock-breaking method avoids violent stratum impact, effectively protects borehole wall stability, reduces collapse risks, and adapts to complex wild working conditions in Africa, Southeast Asia and other regions.

4. Common Standard Drill Sizes

Diamond core drilling follows international unified wireline specification standards. NQ, HQ and PQ are the most commonly used sizes in global mineral exploration. HQ drill string is the mainstream choice for medium and deep hole metal mine drilling, balancing core diameter, drilling efficiency and borehole stability, and is widely used in African nickel mine exploration projects.

5. Xingda Professional Solution for Diamond Core Drilling

Hubei Xingda XDX series full hydraulic core drilling rig is specially optimized for diamond wireline coring technology. The precise hydraulic control system provides stable rotating speed and adjustable feed pressure, perfectly matching NQ/HQ/PQ diamond drilling tools. It ensures high core recovery rate even in fractured and hard rock strata.

Aiming at the pain points of complex working conditions in overseas mines, Xingda provides one-stop supporting solutions including professional diamond bit selection, customized flushing fluid formula, on-site operation training and full-cycle after-sales maintenance. It helps global mining customers complete high-precision geological exploration efficiently and stably, and improves the scientificity and accuracy of mineral resource development.