Ore Mining Reverse Circulation Hammer Performance Tooling Engineered by Boart Longyear

Reverse Circulation Hammer Performance Tooling engineered by Boart Longyear

REVERSE CIRCULATION DRILLING HAMMERS

 

Reverse Circulation RC drilling hammers and hammer drill bits provide outstanding performance along with outstanding reliability and simplicity. Our reverse circulation hammers are suitable for any exploration and grade control process to obtain an accurate sample with no contamination. RC drilling hammers can in most instances carry out continuous sample collection in a fraction of the time necessary with conventional or wireline coring.

WHAT IS RC DRILLING?
 

Reverse circulation (RC) drilling uses a bit attached to a down-hole hammer to produce a hole. Unlike diamond drilling, RC drilling produces samples of rock cuttings rather than a sample of rock core. The down-hole hammer is powered by compressed air, which also acts as the medium bringing the drill cuttings up to surface.
 

Traditionally, RC drill rigs have been known as powerful, heavy truck- or track-mounted machines. Such machines are unsuitable for remote exploration work because of the difficulties and costs associated with moving the drills to site. In Canada, Northspan has changed this by being a front-runner when it comes to designing RC drills, which can be moved to remote drill sites with light helicopters or fixed-wing aircraft.

RELIABLE SAMPLES
 

RC drilling today produces samples of high quality and reliability. Dual-pipe RC drilling utilizes double drill rods where air is passed down the hole through the outside annulus and into the hammer. Drill cuttings are cleared from the bit by the air and travel up through the centre tube of the drill rods remaining free from contamination.
 

There are two main types of RC drilling systems: the centre-sample system and the conventional cross-over system. Using the centre sample system (see schematic), drill cuttings liberated by the bit travel up directly through holes in the bit face and into the centre tube of the drill rods. This method produces an accurate and uncontaminated sample. As a result, RC drilling results are successfully used in compliant resource calculations worldwide. 

When using the conventional cross-over system , cuttings first travel up around the bit before entering the centre tube through cross-over slots. This method is rapid, cost-effective and particularly suited for first pass exploration drilling.

In a number of geological scenarios, the large volume of sample collected by RC systems can be a significant advantage. Exploration projects dealing with a “nugget effect” (for example, coarse gold or diamond projects) can often benefit from a larger diameter drill hole. Northspan generally drills holes with a diameter ranging from 3 ⅝” to 4 ½” (92 mm to 114 mm). The sample recovery from a 3 ⅝” (92 mm) diameter hole is approximately 11 lbs/ft (16.4 kg/m) depending on rock type.
 

RC is a drilling method widely used around the world. The method is unbeatable in areas where water is scarce or expensive, such as Australia and Western Africa (and, for the same reason, in northern Canada).

HIGH RATE OF PENETRATION
 

A big advantage of RC is its high rate of penetration. Penetration rates often exceed 80 m per shift depending on ground conditions. The speed of drilling can often mean big cost savings compared to slower drilling methods.
 

GOOD IN BAD GROUND
 

RC drilling is relatively insensitive to ground conditions, which may be difficult or slow to penetrate using other methods. Dual-pipe RC was originally developed as a method to drill “nightmare” geological formations (such as permafrost, glacial till, broken rock, etc.) where conventional drilling methods were costly and ineffective.
 

RC drill cuttings are transported to surface inside the centre tube of the dual pipe. Because of this sample recovery is usually very good with high recoveries of both fines and clays.
 

ENVIRONMENTALLY SOUND
 

Reverse circulation drilling has several environmental advantages. First and foremost, RC mostly requires no water for rock drilling. This is a benefit in areas with limited or sensitive water supply.
 

In addition, frozen water sources and waterlines can make winter drilling both tricky and expensive, if not impossible. In certain areas, like the arctic tundra, environmental permitting is easier for winter drilling when the ground is frozen and unlikely to be disturbed. Light-weight RC makes winter drilling in the arctic a viable option.
 

Why not carry out land-based winter drilling programs as opposed to more expensive heli-supported summer programs?


 

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FAQ

Terms & Conditions of Ordering:

Quality warranty:
Our products are made of high quality steel and all spares parts are inspected strictly before shipping. We have quickly responses for your complaint and suggestion.

Package:
Using ply-wooden cases and pallet for package to protect the products and avoid the damage during transportation. Also we can customize package according to your special requests.

Production time:
Generally need 15-25 days

Transportation:
By air, By Express or By sea according to your requests.

1. Methods of Payment:
T/T (Telegraphic Transfer) or Western Union or L/C at sight

2. Handling time for an order
Based on order quantity, normally it takes 20 days for production.
in 3 working days after receiving the advance payment

3. Shipping way
Sample order: we suggest Courier express like DHL/UPS/TNT/FEDEX or by air
Bulk order: we suggest by air or by sea.

4. Quality Control
We have our own experienced QC.
There will be strict inspection and testing for every order before shipping out.

5. After Services:
a. Our sales team will response for your question within 24 hours (Holidays Excluded)
b. Technical Support will be available in any time

6. Quality & Service:
A. There will be strict inspection and testing for every order before shipping out.
B. Our sales team and Technical Support will response for your question within 24 hours through skype: ROSCHEN.TOOL and WhatsApp/Wechat: +86-13764195009
C. Free replacement will provide once the failure confirmed caused or our product quality; Not satisfied with a refund.

For more information, please contact:

ROSCHEN INC.
ROSCHEN GROUP LIMITED
ROSCHEN HOLDINGS LIMITED

Skype: ROSCHEN.TOOL , ROSCHEN_GROUP

WeChat: +86-137 6419 5009 ; +86-135 8585 5390

WhatsApp: +86-137 6419 5009 ; +86-135 8585 5390

Email: roschen@roschen.com ; roschen@roschen.net

Website: http://www.roschen.com ; http://www.roschen.net

http://www.roschen.cn ; http://www.roschendrill.com

http://www.roschenmining.com ; http://www.roschendrilling.com