ROCKLABS July 2002...

Mid year greetings from ROCKLABS,
World leaders in the manufacture of Sample Preparation
Equipment and Gold Assay Reference Materials.

Would you like a copy of our new Catalogue or a CD Rom of the Catalogue?
If so, please email us at sales@rocklabs.com

In this issue we are featuring information on the following :

Automated Sample Preparation Systems completed in June for the Musselwhite Mine, Canada. These Systems incorporate items of equipment and features that would be appropriate for many laboratories world-wide . They include crushing, splitting and pulverising, see below for further details.

ROCKLABS has been manufacturing Automated Sample Preparation Systems and Mechanised Sample Preparation systems for the past ten years. The 14th Sample Preparation System is under construction for a diamond mine in Canada. Check out our next newsletter for details of this System.

Ring and Puck Mills, Continuous Ring Mills, Crushers, Rotating Sample Dividers, etc.

Our range continues to expand. For example the Bench Top Ring Mill can be supplied with a chrome steel or carbon steel Head with a maximum sample weight of 100 grams. For the full range of equipment check our product guide.

ROCKLABS Key Personnel

ROCKLABS staff have a wide range of expertise in geochemistry, chemistry, engineering, electrical and electronic engineering, automation, machine design, geology, marketing etc . For more details see "About Us"

Certificated Reference Material for Gold Assaying

Rocklabs Reference Materials are now being used in 33 countries. Eight new values will soon be added to the range. Check "Reference Material" for the full range.

Thank you for your continued support and interest in our products.

Beulah Johnson
Export Sales Manager

Musselwhite Mine Automated System

The two Systems are similar but System 1 has an extra large crusher, the Big Boyd, at the beginning, to handle samples with lumps up to 150 mm. After this preliminary crush, the process is identical in both Systems:

Crush the whole sample finely with a Boyd crusher and deliver the product with a belt conveyor to a Rotary Sample Divider (RSD),

Split out 3 kg of the crushed sample, from any sample weight going in and feed this to a single stage CRM for a fast, coarse pulverise,

Split the 3 kg in a second RSD, to present a set amount, e.g 500 grams, for re-pulverising in a two stage CRM and retain the remainder in a plastic bag held in a plastic pail. The fine product is collected in a cup for transfer to a sample bag and the CRM is cleaned with air flowing through it.

All samples are weighed at the beginning of the process and the weight is used to control the RSDs.

One sample is produced every three minutes on each System. One Operator can operate the two Systems. There are no inwards or outwards stacking of samples.