JDS provided EPCM services and life-of-mine planning for Formation Metals' Idaho Cobalt Project at 8,000' elevation, 40km west of Salmon, Idaho. Mine scope included site access, 1,800m decline development, portal infrastructure, 1,000' tramway, 800 tpd mill and concentrator, dry stack tailings, and water management. The Sunshine Refinery addition in Kellogg included a 30,000 sq ft cobalt process plant for 99.7% purity cobalt production with copper and gold byproducts. Project suspended mid-construction due to financing constraints.

$150M Idaho, USA

JDS managed construction of Eldorado Gold's 25,000 tpd gold plant at Efemçukuru, Turkey, starting March 2009. The scope included plant layout review and revision, oversight of design work with local engineering firms, and complete procurement and logistics management of equipment and materials. JDS's lean construction management team supervised all aspects including cost control, scheduling, health and safety, and environmental management for the $200M Efemçukuru project and $60M Kişladağ expansion.

$260M Izmir, Turkey

JDS provided feasibility study support and full EPCM services for Capstone's Minto Mine, delivering a 1,400 tpd copper-gold process plant from acquisition (mid-2005) to commercial production (June 2007). The $100M project included mine development, dry stack tailings facility, custom Yukon River barge, airstrip, 3MW power plant, 130-person camp, and supporting infrastructure. JDS managed detailed engineering through Hatch and EBA, procurement, construction via Clark Builders and Pelly Construction, and commissioning—all on schedule and on budget.

JDS subsequently completed EPCM for two expansions: first to 2,600 tpd with water filtration for environmental discharge, then to 3,500 tpd. Both expansions were delivered on schedule and on budget.

Yukon Territory

JDS led design and construction of the Naranjo Alto tailings facility for Nyrstar with a $32M budget, one-year timeline, and 900,000 m³ earthworks including HDPE liner installation. JDS procured and mentored local contractors to achieve budget and schedule targets. Following a project design review, JDS managed staging optimization that reduced initial capital costs to $6.2M by lowering initial elevation and limiting liner to the downstream face only. JDS also managed an expansion raise lift to the existing tailings pond. All work was completed under budget and on schedule.

$20M Guerrero, Mexico

JDS provided engineering and construction management for Newmont's Hope Bay Phase I 800 tpd mine and mill, designed for future expansion to 3,200 tpd. The year-round northern construction program included a Boeing 737-capable airstrip, frozen core tailings dam, 6,000 m² mill foundation and building, prefabricated mill from South Africa, 12 MW power plant, 27.5M liters diesel storage, pipelines, camp facilities, and supporting infrastructure for anticipated April 2014 production. Newmont placed the project on care and maintenance in February 2012.

$150M Nunavut, Canada

JDS delivered a turnkey 2,400 tpd magnetite processing plant for Canadian International Ltd. to supply media-grade magnetite to Western Canadian coal producers. The design-build-operate project included metallurgical testwork, process flowsheet development, detailed engineering management, procurement of all equipment including a used ball mill, construction and commissioning management, HSE program implementation, and daily plant operations. The project was completed on budget, on schedule, with zero incidents.

$22M Mt. Polley Mine, BC

JDS transformed a sub-economic diamond project into a viable $750M development through re-scoping studies that optimized waste management, processing rates, and execution strategy. JDS produced the Definitive Feasibility Study and partnered with Hatch to deliver EPCM services for the remote fly-in mine, accessible by 420km ice road only 2 months annually. Construction included complete processing facilities, 14MW power plant, 450-person camp, jet-capable aerodrome, 3M m³ earthworks, 25M BCM dewatering, and 8M BCM pre-stripping. The 3.5M workforce-hour project was completed safely, on budget, on schedule, with first ore delivered June 14, 2016.

Northwest Territories

JDS confirmed the large silver-rich "super pit" zone for Metallic Ventures (later acquired by Alexco), managed a 30,000-meter, $4M drilling program, oversaw assaying, and completed a revised NI 43-101 technical report for resource estimation. Metallurgical advances enabling sulfuric acid leaching of oxide zinc with electrolytic reduction shifted exploration focus to oxide zinc mineralization. JDS completed and published the PEA in October 2013 demonstrating strong economics: pre-tax NPV5% of $463M, 26.9% IRR, and $297M pre-production capex.

$800K Coahuila, Mexico

JDS completed expansion of the remote Skagway, Alaska terminal facility, including demolition of existing structures, environmental stewardship, lead abatement program, and compliance with Alaska Industrial Development and Export Authority (AIDEA) requirements. JDS developed and executed proper handling and disposal procedures for contaminated structures, implemented comprehensive HSE programs, and managed local contractors for construction, operation, and maintenance of all electrical, mechanical, and structural systems. The project was completed on time, on budget, with zero incidents.

$2.4M Skagway, Alaska

JDS managed the complete relocation and transport of processing equipment to Guyana Goldfields' Buckhall site. The scope included preparing equipment for shipment (adding members, reducing module sizes, containerizing), sourcing vessels, quayside loading oversight, laydown preparation, and Georgetown-to-Buckhall transportation. Due to the oversize modules exceeding Guyana's port capacity, JDS executed an innovative solution: discharging breakbulk cargo port-side to moored barges, then transporting 70km down the Demerara and Essequibo Rivers to Buckhall. The project was completed in 2.5 months including 16 days sailing time.

$2.5M USD Durban, South Africa

JDS delivered design-build, self-perform services for Hope Brook Mining Limited's comprehensive tailings and water management system in 2013. The project included over 12km of HDPE pipeline transporting tailings to a new Cyclone Sand Plant for coarse sand separation and dam construction material, installation of 600hp and 200hp booster pumps, a complete CSP facility with pre-engineered building, new reclaim water barge and pump infrastructure at TMF-3, 5km of reclaim water pipeline, seepage control systems, and 5.5km of 13.8kV overhead power line. The project was completed on time, under budget, with zero lost-time injuries.

$13M Houston, British Columbia

JDS designed, supplied, and installed hot water systems, piping, power, and pumping infrastructure to extend diamond core drilling operations by four months annually during cold weather at this remote northern exploration project. JDS also designed and constructed an airstrip for 208 Caravan aircraft to reduce transportation costs, procured and assembled equipment via Hercules transport, and mobilized camp kitchen and sewage treatment facilities to support camp expansion while maintaining regulatory compliance. Implementation of JDS's HSE program improved site safety performance, with the project completed on time, on budget, and incident-free.

$9.5M Nunavut

Following the Feasibility Study, JDS was engaged by Goldcorp to provide EPCM services and two-year mine operations for the Coffee Project, a planned 200,000 oz/year heap leach gold mine south of Dawson City, Yukon. The comprehensive scope included a 214km access road with river barge crossings, 425-person camp, 18,000 tpd crushing plant, ADR plant, airstrip, maintenance facilities, water management infrastructure, 60Mt heap leach pad, steel storage tanks, and 450MW power plant. Following Newmont's acquisition of Goldcorp, the project was placed on hold while assets are prioritized. JDS continues to provide logistical support.

Yukon Territory

JDS provided on-site construction management and supervision for the Cow Mountain Portal development, enabling access to a 10,000-tonne bulk sample at Barkerville Gold Mines' Cariboo Gold Project. Work included a 300m non-contact diversion ditch, 6m x 6m x 25m Arch Lock Tunnel with retaining wall, 4,000m² pad construction, and significant earthworks totaling 30,000m³. JDS also managed mobilization of BGM's Sandvik MT-720 Road Header between portals, designed and constructed a 2,200m insulated and heat-traced dewatering pipeline, and provided ongoing operational support for road header operations.

Wells, BC

JDS led the 2017 Feasibility Study for Pure Gold Mining Inc.'s Madsen Project, managing all study components and third-party consultants to deliver a permit-aligned outcome. The FS demonstrated strong economics with an after-tax NPV5% of $247M, 36% IRR, and 3.4-year payback. JDS was subsequently engaged for EPCM services, with construction approximately 50% complete and first gold production scheduled for late 2020.

Red Lake, ON

JDS provided EPCM services for Guyana Goldfields Inc. to expand the Aurora Gold Mine processing plant in Guyana, South America. The two-phase project increased hard rock throughput from 5,600 tpd to 7,500 tpd while improving gold recovery by 2-3%. Phase 1 delivered a 1,000 tpd capacity increase with 1% recovery improvement, followed by Phase 2 adding another 900 tpd and 1-2% additional recovery enhancement.

$24.5M USD Guyana, South America

JDS managed the dismantling, relocation, and reassembly of the Sa Dena Hes Mine concentrator facility for transport to the Silvertip project, 200km away. The three-month project included safe deconstruction of near-new equipment and facilities—crusher building, concentrate building (SAG/ball mill, pumps), powerhouse, and outbuildings. JDS developed building-specific safety procedures, dismantling methodologies, and demolition sequencing to ensure successful facility relocation.

$6M Yukon Territory

Successfully completed remediation of the former Giant Nickel Mine near Hope, BC in 2017-2018. The project regraded and stabilized tailings facilities closed over 40 years ago, ensuring long-term site safety through improved water management, enhanced embankment stability for seismic events, and optimized drainage systems—achieving sustainable passive closure.

$20.5M British Columbia

Since 2017, JDS has delivered project management and EPCM services for critical Nickel Plate Mine closure work, including emergency spillway construction, $6M water treatment plant upgrades completed under budget, and TSF buttress development—providing full-cycle support from feasibility through construction supervision and quality assurance.

$650K British Columbia

JDS produced two NI 43-101 compliant Preliminary Economic Assessments and a Pre-Feasibility Study for Capstone Mining's Santo Domingo Project in Chile. Each study enhanced project economics and advanced development. JDS responsibilities included underground mine design and planning, infrastructure engineering and design, process plant design, metallurgical testing, capital and operating cost estimation, and overall study management. Studies were delivered on budget and ahead of schedule, improving economic returns for the 2,500 tpd, $200M capital project.

$2M Dease Lake, BC