In early 2017 we commenced earthworks at Stockton Mine to raise the height of an earth dam embankment to increase the dam’s storage capacity. This work was halted late July 2017 due to adverse weather conditions and recommenced mid-December.
Dam construction utilises EC290 and EC360 excavators, A40E articulated dump trucks, D8T dozer, 16H grader and steel drum roller.
The crew selects, processes and excavates material from several borrow pits, and carts on haulroads and modified haulage routes on the embankment and into one of three zones – impermeable, transition and bulk. The material is dumped and dozer pushed into layers. A grader is used to maintain access across the embankment to each zone. Compaction is provided by truck roll in bulk and transition zones and vibrating steel drum roller in the impermeable zone.
The impermeable zone (1m thick in cross-section) on the wet face of the dam requires the compaction of <400mm sandstone or granite material to target density with the vibrating roller.
The site is very susceptible to wet weather, more-so during the winter months, with material easily saturated. Construction therefore requires maximum use of dry weather to dry out and progress the works before sealing the fill, bunding, and roads, and reinstating drainage channels ready for the next rain event.
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