Mining · Blast-Hole Bits

Mining & Blast-Hole Drill Bits for Guyana

Air-flush tricone bits, pilot bits and fixed-cutter (FDC) bits for Guyana's hard-rock gold mines, quarries and exploration programmes. Volga Burmash AIRJET, AIRPRO and AIRXTREME roller cone bits drill rotary blast holes with air or air-water flushing from 171.4 mm (6 3/4") to 406.4 mm (16"); MTR837 and GRDX837 pilot bits drill raise-boring pilot holes; steel-body FDC bits with PDC cutters (76–98 mm) serve exploration, methane drainage and injection drilling.

Request a Quote Gold Mining Guide

76.0–444.5 mm Air & Air-Water Flush Hard-Rock Duty

Catalog

Product Categories

Three mining-bit families from the Volga Burmash range, each matched to hole size, formation hardness and rig type.

AIR-FLUSH

Air-Flush Tricone Bits

Roller cone bits for rotary blast hole drilling with air flushing, in three product lines: AIRJET (open roller bearing), AIRPRO (sealed roller bearing, enhanced performance in holes where water is present) and AIRXTREME (sealed journal bearing). Tungsten carbide insert cutting structures, a side or combined jet (optionally four jets) and a leaf-type back flow valve.

Diameter	171.4 mm (6 3/4") – 406.4 mm (16")
Flush	Air or air-water mixture; side or combined jet
Bearing	Open roller (AIRJET), sealed roller (AIRPRO), sealed journal (AIRXTREME)
Formations	Soft to hard (per IADC codes, TCI series 4 to 7)
Application	Rotary blast hole drilling

PILOT

Pilot Bits

Roller cone pilot bits for pilot hole drilling during raise boring operations; the pilot hole is then enlarged by raise-boring reamers to the design shaft diameter. Supplied from the Motor (MTR837) and GrandXtreme (GRDX837) product lines with the IADC code 837Y.

Diameter	228.6 mm (9") – 444.5 mm (17½")
Connection	API Regular pin: 4 1/2", 6 5/8" or 7 5/8" Reg
Bearing	Sealed journal bearing
Application	Pilot holes for raise boring
Cutting structure	TCI, IADC 837Y

FDC

FDC Mining Bits

FDC bits for the construction and mining industries, used for exploration drilling, methane drainage borehole drilling and injection drilling. They comprise a steel body and polycrystalline diamond cutters (PDC) and drill both vertical and directional full-hole wells; flushing ports directed towards the well bottom clean the hole.

Diameter	76.0 mm (3") – 98.0 mm (3 27/32")
Cutters	PDC cutters
Body	Steel
Connection	2 3/8" Reg pin or NW (DCDMA), depending on size
Application	Exploration, methane drainage and injection drilling

Where they drill

Mining & Quarrying Applications in Guyana

From the greenstone gold belts of the hinterland to the granite quarries feeding Georgetown's construction boom, VBM matches the right mining bit to each operation's geology, rig fleet and flush method.

Hard-Rock GoldAurora & Eagle Mountain

Underground and open-pit producers such as Aurora and Eagle Mountain drill abrasive Proterozoic greenstone where gauge wear is severe. Air-flush AIRJET, AIRPRO and AIRXTREME tricone bits, with IADC codes from soft to hard formations, drill the production and bench holes for operators working under GGMC tenure and GGDMA membership.

Alluvial & Small-ScaleHinterland mining

Across the hinterland, small and medium-scale miners working alluvial and saprolite ground need rugged, low-cost bits that tolerate weathered, water-bearing formations. AIRPRO air-flush tricone bits, with sealed roller bearings, are designed for enhanced performance in holes where water is present.

Quarrying & AggregatesGeorgetown construction boom

The construction surge around Georgetown and the East Bank corridor is driving demand for crushed stone. Granite and dolerite quarries drill rotary blast holes across their benches, where straight, on-gauge holes give clean fragmentation and predictable blast patterns; AIRJET, AIRPRO and AIRXTREME bits cover 171.4–406.4 mm.

ExplorationMixed weathered-to-fresh rock

Mineral exploration crews drill mixed sections from soft weathered laterite into fresh crystalline basement. Steel-body FDC bits with PDC cutters (76.0–98.0 mm) are used for exploration drilling in vertical and directional full-hole wells.

Quick Reference

Mining Bit Selection Quick Reference

A first-pass guide to bit type and flush by application and hole size. For a firm recommendation, send us your formation, rig and offset data and we'll match the IADC grade and hydraulics.

Application	Hole Diameter	Recommended Bit	Flush
Bench blast holes	171–406 mm	Air-flush tricone (AIRJET, AIRPRO, AIRXTREME)	Air or air-water
Gold production drilling	200–250 mm	Air-flush TCI tricone	Air or air-water
Raise-boring pilot hole	228.6–444.5 mm	Pilot bit (MTR837, GRDX837)	—
Exploration drilling	76–98 mm	FDC bit (steel body, PDC cutters)	—
Methane drainage & injection boreholes	76–98 mm	FDC bit	—

Matching Carbide Grade to Abrasive Greenstone

Guyana's hinterland gold ground is dominated by abrasive Proterozoic greenstone and silicified shear zones that grind down soft carbide grades long before a bit reaches its footage target. The answer is a tougher, higher-cobalt tungsten-carbide grade: more cobalt binder absorbs impact and resists fracture under percussion, while a controlled grain size keeps the inserts and buttons from chipping in blocky, fractured rock. Getting that balance right is the difference between a bit that finishes a bench and one that comes out of the hole at half gauge.

Volga Burmash uses chisel-shaped and conical tungsten carbide inserts in its roller cone bits and also manufactures tungsten carbide products on request. Carbide grades are not published in the VBM product list, so we select a VBM bit by IADC code — cutting structure, insert type and bearing for the formation; the oil and gas range is on our tricone bits page.

Not sure which grade or bit type suits your ground? Our gold mining and quarrying guide walks through formation hardness, flush selection and cost-per-metre for Guyanese conditions, or send us your offset data through the form below for a formation-matched recommendation.

Selection guide

Choosing blast-hole bits for gold mines and quarries

Hole diameter, bearing type and cutting structure decide the cost per metre on a mining bench. Here is how to set them for Guyanese operations.

Hole size by operation

Large open-pit gold mines: production holes of 7 7/8" to 9 7/8" (200–250 mm) drilled with rotary blast-hole rigs.
Quarries and aggregate producers: 6 3/4" to 7 7/8" (171–200 mm) with rotary rigs; smaller holes are usually drilled with DTH hammers.
Exploration: reverse-circulation (RC) drilling for fast, representative chip samples — we also stock RC bits.

AIRJ, AIRP or AIRX

The third digit of the model number follows IADC logic (each datasheet confirms it). AIRJ models end in 2: open roller bearings cooled by the flushing air. AIRP models end in 5: sealed roller bearings with gauge protection, with enhanced performance in holes where water is present. AIRX models end in 7: sealed journal bearings of wear-resistant materials with gauge protection.

Cutting structure for greenstone

Weathered saprolite and overburden drill well with TCI series 4–5; fresh greenstone and metavolcanics need series 6; quartz veins, granite and diabase call for series 7–8 with conical inserts. If a bit loses gauge before the inserts wear, step up in hardness or choose a gauge-protected model. See the gold mining and quarrying guide and the IADC code guide.

In stock in Dubai

Mining Drill Bits in Stock in Dubai

221 pcs across 46 line items, ready to ship from our warehouse in Dubai (United Arab Emirates). Stock list updated 23 September 2026. Prices on request.

Shipping to Guyana from Dubai by air or sea freight. Exact lead time is confirmed with every quote.

Air-flush mining tricone bits (AIRJ, AIRP, AIRX) and RC bits: Dubai stock as of 23 September 2026
Model	Size	Application	Available	Quote
DTH-RC5C2S	5 1/2" (140 mm)	Mining, RC drilling	10 pcs	Quote
AIRJ532	6 3/4" (171.4 mm)	Mining, blast holes	3 pcs	Quote
AIRJ542	6 3/4" (171.4 mm)	Mining, blast holes	3 pcs	Quote
AIRJ432	7 7/8" (200 mm)	Mining, blast holes	2 pcs	Quote
AIRP615	7 7/8" (200 mm)	Mining, blast holes	2 pcs	Quote
AIRX417	7 7/8" (200 mm)	Mining, blast holes	90 pcs	Quote
AIRJ732	8 1/2" (215.9 mm)	Mining, blast holes	4 pcs	Quote
AIRP345	8 1/2" (215.9 mm)	Mining, blast holes	2 pcs	Quote
AIRJ412	9" (228.6 mm)	Mining, blast holes	5 pcs	Quote
AIRP415	9" (228.6 mm)	Mining, blast holes	16 pcs	Quote
AIRP435	9" (228.6 mm)	Mining, blast holes	18 pcs	Quote
AIRJ422	9 7/8" (250.8 mm)	Mining, blast holes	2 pcs	Quote
AIRJ522	9 7/8" (250.8 mm)	Mining, blast holes	21 pcs	Quote
AIRJ622	9 7/8" (250.8 mm)	Mining, blast holes	3 pcs	Quote
AIRJ622	11" (279.4 mm)	Mining, blast holes	7 pcs	Quote

Showing the 15 line items with the most units out of 46.

Request a quote See full Dubai stock list

FAQ

Mining drill bit FAQ

Which mining bits do you have in stock?

Air-flush tricone bits from the AIRJ, AIRP and AIRX series, mostly from 7 7/8" to 12 1/4", plus RC bits for exploration. The table on this page shows current stock by model and size.

What does air-flush mean?

Cuttings are blown out of the hole with compressed air instead of drilling mud. The air passes through the bit nozzles, cleans the bottom of the hole and, on open-bearing models, also cools the bearings.

What is the lead time to Guyana?

We ship from our Dubai warehouse by air or sea; the exact lead time is confirmed in each quotation.

Will your bits fit my blast-hole rig?

Our air-flush tricone bits use API Reg pin connections, and some sizes 4 1/2" FH or 6" BECO pins. Tell us the rig model and the drill pipe connection and we will confirm size and thread.

Request a Quote

Let's spec the right bit for your project.

Tell us your hole size, formation and target depth. As the authorized Volga Burmash distributor in Guyana, we'll match a tricone, PDC or mining bit and respond with availability and pricing.

info@vbm.gy

Direct supply from the Volga Burmash plant
IADC formation-matched recommendations
Local Content registered-supplier support