In our Opencast mine Shovel-dumper combination is used for excavation of overburden and ore. During rainy season, due to nickli-ferrous-limonite (approx. 40-50 LCM) present in the overburden material, the haul roads (Length x Width: approximately 100 km x 20 m; working length in monsoon: typically 20-25 km) become too slippery, making it difficult for dumpers (35 MT/50 MT) to maintain operation under control and ply normally. Additionally, the dumper operation on unstable slope causes damage to the tyres, which results in the increased load on the maintenance work. Keeping the safety precautions in line, the movement of equipments is stopped during rain/drizzle. This leads to productivity loss during rainy season. To continue the operations during rainy seasons, haul roads are covered with morum/quartz/HUB. However, this method is not sustainable owing to
Additional factors affecting safety of the haul roads are:
Jet of water washing down the benches, during rainy reason, washes down the slippery material on the haul road, this sticks and keeps on accumulating on the chains, tyres and adjoining portions of Dumper. Consequently, the grip of the tyres reduces causing unsafe plying conditions.
Making drainage facilities (for rain water) is not possible in the mines this leads to piling up of materials that are slippery in nature.
Therefore, we are looking for solutions, which will facilitate the movement of mining equipments and normal operation of mines during rainy seasons
The solutions must meet the following requirements:
1) Mining Operation shall continue during drizzle / rain/downpour atleast 50% of the days lost in FY18
2) All chain/tyre mounted mobile equipment shall be able to move on the haul roads
3) Shall comply to mining statutory requirements
4) Shall be economical.
5) Shall not hamper mining during non-rainy days.
6) The suggested solution should facilitate/sustain the movement of mining equipment such as shovel/dumper/dozer/Grader.
Additional information about the surrounding nature of soil
Additional information about the machines/vehicles moving on the haul roads
You may like to refer to this link for more details: https://www.australianmining.com.au/features/the-nickel-laterite-challenge/