Small Gold Mining Drill Rig Deep Hole: CSD500L in Hami, Xinjiang, China

Executive Summary

A gold exploration program in Hami, eastern Xinjiang (northwest China), required a compact, mobile rig capable of drilling a 405 m deep exploration hole at a 75 mm borehole diameter in the open Gobi desert. The contractor selected the CORTECH® CSD500L — a 5.7-ton crawler-mounted full hydraulic diamond core drilling rig — which delivered the deep-hole wireline coring capacity, independent desert mobility and integrated drilling-fluid system that the scattered, road-light project demanded. The CSD500L completed the 405 m hole well inside its certified coring envelope, giving the team reliable core data to assess the gold ore body.

Project Background & Challenge

Hami sits on the Gobi Desert, where gold prospects are small, scattered and far from paved roads. For a junior explorer or small operator, the challenge is economic as much as geological:

• Small ore body, tight budget: a small gold mining project cannot justify a 20-ton-class deep rig or a permanent drilling camp. The chosen small gold mining drill rig deep hole must reach the target horizon while keeping mobilization, fuel and crew costs low.
• Desert mobility: soft sand, gravel plains and the occasional wash-out mean truck-mounted rigs can bog down, while skid-mounted units need external towing and cranes the project does not have.
• Single-hole deep coring: the planned exploration hole reached 405 m at 75 mm diameter — deep enough to test the ore shoot, but requiring genuine wireline coring depth rather than a shallow blast-hole drill.
• Self-contained fluid system: water and mixing equipment are scarce in the Gobi, so a rig carrying its own mud pump and mixer is a major advantage.

Our Solution

The project deployed the CORTECH® CSD500L, a compact crawler full hydraulic surface core drilling rig purpose-built for small, remote diamond coring campaigns. Key design choices that matched the Hami conditions:

• Right-sized deep-hole capacity: the CSD500L is rated for up to 650 m (B size, 55.5 mm), 500 m (N size, 71 mm) and 300 m (H size, 89 mm) wireline coring. The 405 m production hole at 75 mm was therefore drilled with comfortable margin, leaving headroom for deeper step-out holes in follow-up programs.
• Crawler chassis for desert relocation: the rugged steel track chassis climbs 20° slopes and trams at 1.7 km/h, letting the rig move itself across sand and gravel between scattered gold showings without a tractor or crane.
• 8.6 m mast for 6 m rod pulls: the long mast allows a single lift of 6 m drill rods, cutting rod-handling trips and tripping time — the dominant non-drilling cost at 400 m depth.
• Integrated mud pump and fluid mixer: the onboard drilling-fluid plant removes the need to truck in separate pumps and mixing tanks, a decisive logistical benefit in remote desert terrain.
• Lightweight, transportable: at 5.7 tons, the rig loads onto a standard low-bed trailer for predictable freight between sites and abroad.

Key Results

For the full technical specifications of the CORTECH® CSD500L, see the CSD500L product page.

Customer Value & ROI

• Lower cost per meter on small holes: a 5.7-ton rig burns less fuel, needs a smaller crew and mobilizes cheaply — the right economics when the target is a single 400 m hole, not a multi-kilometer campaign.
• No crane, no external fluid plant: crawler tramming plus the integrated mud pump/mixer removes two of the largest hidden cost items in desert exploration.
• Room to grow: the 500 m N-size rating leaves headroom for follow-up step-out holes without a second capital purchase.

FAQ

How deep can a small gold mining drill rig drill?

The CORTECH CSD500L small gold mining drill rig is rated for up to 650 m of wireline coring on B-size (55.5 mm) rods, 500 m on N-size (71 mm) and 300 m on H-size (89 mm). In the Hami Gobi project it completed a 405 m deep gold exploration hole at 75 mm diameter.

What diameter hole can a CSD500L drill for gold exploration?

The CSD500L is configured for standard diamond wireline coring rod sizes (B 55.5 mm, N 71 mm, H 89 mm). The Hami production hole was drilled to a 75 mm borehole diameter, typical for exploring and assaying a gold ore shoot.

Is a crawler rig suitable for Gobi desert gold exploration?

Yes. The CSD500L's steel crawler chassis trams at 1.7 km/h and climbs 20° slopes, so it relocates itself across sand and gravel plains without a tractor or crane. Its integrated onboard mud pump and mixer also removes the need to truck in separate fluid equipment.

What should I look for when selecting a small gold exploration drilling rig?

Match the wireline coring depth rating to your planned hole depth with margin; check crawler mobility for remote sites; confirm an integrated drilling-fluid system where water is scarce; and verify CE and ISO 9001/14001/45001 certification.

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