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[Tyres}

Steps to help eliminate spillage on haul roads include:

Ensuring good windrow maintenance, to keep dumped material clear of truck tyres.

Eliminating soft spots and rough patches.

4.

Minimise operation in wet conditions: Wet conditions pose an extremely high risk of tyre cut damage. Tyres are more prone to cutting when rocks and spilt materials are wet and slippery, while puddles can hide rocks that an operator might otherwise avoid.

Targeted loading on the part of your shovel and loader operators, to ensure the load is fully within the truck body, and properly distributed to minimise the chance of spills.

On corners, either instructing your drivers to reduce speed or incorporating superelevation to ensure the truck and its load remains properly balanced at all times.

Ensuring that truck loads are positioned to minimise spillages on the haul road during gear changes.

In addition, operating over a wet surface, exposes the roadbase, and increases the risk of tread cuts.

Repairing cut-damaged tyres Eliminating soft spots and rough patches of haul road, where loads can bounce out and/ Repair of cut-damaged tyres is another option for extending tyre life. While a repair can never or tyres can be damaged. return the tyre to its original level of structural 3. Control your dump area: The dump area integrity, it can improve the opportunity for you to offers further potential for tyre damage from safely get close to a full life from a damaged tyre. spilt loads and poor operating practice as fully loaded trucks manoeuvre into position. While it is possible to effectively repair tyres that have been quite badly damaged, timely removal Steps to control your dump area include: of cut-damaged tyres for repair will ensure you • Incorporating dedicated roads in the dump keep repair costs to a minimum, and are able to area; instead of allowing trucks to travel get maximum life from the repaired tyre. anywhere in the dump area, a dedicated road In the case of damage to the tread area, a tyre is easier to keep clear of spilt materials and is a far smaller area that needs to be maintained. should be removed for repair when separation on the top belt occurs, or when the belts have • Using a dedicated grader or dozer to keep been penetrated. the area clean. Damage to the sidewall area requires removal f • Instructing your drivers to only perform an or repair once the steel ply is visible. “L- turn” at the dump area, rather than a U-turn; U-turns produce significant side force Operating tyres within their capabilities loadings on the front tyres, increased tyre Ensuring your tyres are operated within their wear and higher rates of material spillage capabilities is critical to ensuring maximum tyre life. (see diagram for correct procedures). •

Apart from cut damage caused by sharp rocks and rubble, heat is the great enemy of tyres. Tyres that are consistently overheated will break down and fail well before their maximum life. In the past, many mining operations have chosen to overwork their tyres, happy to trade off shortened tyre life in return for higher productivity. However, today, with the likelihood of tyre shortages requiring equipment to be stood down, this philosophy needs to be reconsidered. The prime indicator of a tyre’s capability is the TKPH (tonne/kilometres per hour) rating. Each earthmover tyre has a TKPH rating; if it Australasian Mining Review 2011: issue 2.1

Australasian Mining Review Issue 1 2011  

The Australasian Mining Review is a high quality publication that is destined to become an indispensable tool for all stakeholders and parti...

Australasian Mining Review Issue 1 2011  

The Australasian Mining Review is a high quality publication that is destined to become an indispensable tool for all stakeholders and parti...

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