Castle Mountain Pad 1A Construction & Contract Mining
Leach pad construction and contract mining operations
Quick Facts
Location
Hart, California
Role
Earthworks Contractor
Completion Date
June 2020
Project Overview
This project constructed an approximately 3 million square foot leach pad to stack and process the stockpiled ore located in a previously mined pit. Following the construction of the leach pad and other sitewide improvements, Phillips began 14.3M yards of contract mining for Equinox Gold.
Project Highlights
160
AC of Clearing & Stripping
208K
CY of Topsoil Removed
767K+
CY of General Excavation & Embankment
200K+
CY of Leak Detection Gravel Loaded/Hauled/Placed
208K+
CY of Overliner Gravel Loaded/Hauled/Placed
13,360
LF of 2" HDPE Pipe Installed
18,570
LF of 4" HDPE Pipe Installed
19,880
LF of 18" HDPE Pipe Installed
17,837,185
CY Mined
594
LF of 20" HDPE SDR Pipe Installed
13M+
SF of Liner
Phillips Contribution
Phillips was the earthworks contractor that performed all heavy civil activities during the leach pad construction. This included site preparation such as clearing and grubbing, removing and hauling topsoil to designated areas, and mass cut-to-fill and grading to construct the leach pad subgrade.
After site preparation, Phillips began construction on vadose zone drains, service perimeter roads, and a solution collection channel leading to the process plant area. As an earthworks contractor, Phillips was responsible for excavating and grading historical heap leach pad sideslopes, the anchor trench, the event and tank ponds, and the structural wall. Throughout the project, Phillips supported geomembrane liner installation while also constructing two-foot leak detection and overliner layers complete with 4” HDPE and 18” and 20” HDPE piping systems, respectively.
To finalize the pad and prepare for mining activities, Phillips performed cut-to-fill and grading services for vertical and mechanical construction and built the mining haul road.
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