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Optimising Open Pit to Underground Cut-over Snowden

There are a range of parameters (price, production rate, open pit mining cost, underground mining cost, and open pit cut-off grade) that can be tested to identify the sensitivity of the optimal transition point. Snowden has undertaken some case studies on the sensitivity of the transition point using its Evaluator software; these are presented in the charts below.

The formula at the heart (and mind) of mine plan

Lerchs, H., & Grossman, I. (1965). Optimum Design of Open-Pit Mines. Transactions of the CIM,LXVIII, 47-54. I put these in quotation marks as these terms are not technically correct and are the source of some confusion with practitioners. We will discuss this later. Optimising a combined open pit and underground strategic plan, 2008. This paper looked at the decision making around whether to extract blocks from underground from an area that will be subsequently mined by an open pit.

Evaluator • Snowden

In the mid-2000s, Snowden recognised the lack of suitable tools to help optimise the strategy for underground mines to develop robust solutions in a rapid and robust way (similar to tools like Whittle 4X that are routinely used for open pit modelling). Many mining projects have suboptimal plans due to a lack of understanding of the project value drivers, and the need to optimise a project globally for NPV.

Team • Snowden

He has been involved in over 200 studies in Australia, South America, North America, Africa, Europe, and Asia; across precious metals, base metals, industrial minerals and iron ore, and for both open pit and underground mining methods. As Global Manager of Snowden, Tarrant is responsible for the strategy and operations of the Snowden business. Tarrant is passionate about improvement and strategy; to

Snowden: Open Pit Mine Planning Engineers Australia

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Snowden: Open Pit Mine Planning

Snowden: Open Pit Mine Planning. Events; Snowden: Open Pit Mine Planning; Event Date. Wed 12 Nov 2014 8:30 am to Thu 13 Nov 2014 5:00 pm . Add to: Google Calendar Outlook/iCal Other. Venue. 87 Colin Street, West Perth. Cost. Host(s) Snowden. Event Contact. Contact: Shannon Alliss Phone: +61 8 9213 9213 Email: Register for this Event . Snowden: Open Pit Mine

PUSHBACK 8 SOUTH A CASE STUDY IN PIT SLOPE

Snowden Mining Industry Consultants Perth, Western Australia ABSTRACT Pushback 8 South is the final cut back on the south wall of the East Pit at BHPBilliton’s Mt Whaleback iron ore mine in the Pilbara region of Western Australia. Development of the cutback commenced in 1999 and is now nearing completion with ultimate pit walls up to 300m high.

Haulage Automator • Snowden

In completing open pit mining studies, a common problem we have faced over the years is how to quickly generate auditable haulage profiles for calculating productivities and costs. Given the cost pressures in the market, the need for efficiency has increased. Historically, we would, depending on the level of study, and materiality of the haulage, either (a) estimate haulage via segments in a

at the Cleo open pit in Western Australia

Snowden provides open pit and underground mining consulting services ranging from resource evaluation through geotechnical engineering to mining engineering. Article prepared as “Top Project” for RocNews e-newsletter, January 2002. Figure 1: Northwest view of ultimate Cleo pit design However, in a geotechnical context, there has been uncertainty regarding the local characteristics of the

6-94_Snowden AusIMM

6-94_Snowden; The Golden Mile, which has been mined continuously for the past 100 years by both underground and more recently open pit methods, occupies an area of 1.2 km by 4 km adjacent to the city of Kalgoorlie Boulder in Western Australia (Figure 1). Large-scale open pit mining at the Kalgoorlie Consolidated Gold Mines (KDXN) Fimiston operations is currently extracting 7.8 million tonnes

Snowden: Open Pit Mine Planning Engineers Australia

Skip to main content Back to Home. Primary. For individuals Overview; Student engineer

Block Cave Optimisor • Snowden

This is akin to cutbacks in an open pit. The Solution. At Snowden, we developed Block Cave Optimisor tool to optimise the footprint and column heights for a cave, considering all these important constraints. First, it applies vertical pre-mixing to gain a more accurate view of mining grades. It also optimises at a range of cut-off grades in order to provide a nested set of outlines for panel

Snowden: Open Pit Mine Planning

Snowden: Open Pit Mine Planning. Events; Snowden: Open Pit Mine Planning; Event Date. Wed 12 Nov 2014 8:30 am to Thu 13 Nov 2014 5:00 pm . Add to: Google Calendar Outlook/iCal Other. Venue. 87 Colin Street, West Perth. Cost. Host(s) Snowden. Event Contact. Contact: Shannon Alliss Phone: +61 8 9213 9213 Email: Register for this Event . Snowden: Open Pit Mine

PUSHBACK 8 SOUTH A CASE STUDY IN PIT SLOPE

International Symposium on Stability of Rock Slopes in Open Pit Mining and Civil Engineering Pat Walker Page 435 PUSHBACK 8 SOUTH A CASE STUDY IN PIT SLOPE MANAGEMENT PA Walker, P Knight, T Johnson and H E Speight Snowden Mining Industry Consultants Perth, Western Australia ABSTRACT Pushback 8 South is the final cut back on the south wall of the East Pit at BHPBilliton’s

Resources & Reserves Monument Mining Limited

(5) Mineral Resources estimated by John Graindorge (Principal Consultant, Snowden), QP. (6) The majority of the interpreted mineralization is within 200m of the surface and as such considered by Snowden to be within the limits of extraction by open-pit mining.

Reserves and Resources Endeavour Mining

Cut-off grades for Golden Hill open pit Mineral Resources range from 0.49 Au g/t to 0.55 Au g/t The reserve estimation study has been carried out internally for Boungou, Ity, Hounde, Karma and Mana, Sabodala and Wahgnion, Fetekro and Kalana studies were carried out by Snowden.

A probabilistic model to improve reconciliation of

Many of the open-pit mines suffer from the lack of reconciliation between estimated and actual grades. In a mining operation, grade reconciliation is the comparison between the values of the estimated grade calculated in exploration stage and the actual grade obtained from more reliable data such as blast holes’ samples. Many different factors affect the degree of reconciliation in a mining

6-94_Snowden AusIMM

6-94_Snowden; The Golden Mile, which has been mined continuously for the past 100 years by both underground and more recently open pit methods, occupies an area of 1.2 km by 4 km adjacent to the city of Kalgoorlie Boulder in Western Australia (Figure 1). Large-scale open pit mining at the Kalgoorlie Consolidated Gold Mines (KDXN) Fimiston operations is currently extracting 7.8 million tonnes

Snowden: Open Pit Mine Planning Engineers Australia

Skip to main content Back to Home. Primary. For individuals Overview; Student engineer

NEWS RELEASE TSX.V PDG

(Snowden) and Knight Piésold Canada, has established strong economics for the proposedopen robust economics of our proposed open pit gold mine at Magino. With a projected mine life of nine years, cash costs of $496US (Cdn$521) per ounce and rapid payback of capital, Magino is developing into one of the leading undeveloped gold projects in eastern Canada. The on-going in-fill drilling

Araguaia, Brazil's next major Ferronickel Project

Snowden completed a site inspection on three occasions between March 2016 and May 2017 by Mr Frank Blanchfield FAusIMM, an appropriate “independent qualified person” as such term is defined in NI 43-101. Mining. Araguaia will use an open pit mining method, transporting its nickel-ore to a central processing plant. The open pits will be shallow, with a maximum depth of 30m and no blasting

Mosquito Consolidated Gold Mines Ltd

Snowden is a premium provider of consulting services, technology solutions and technical training to the mining and related sectors. It has offices worldwide and are considered experts in the study and development of major open pit accessible deposits. Snowden will also be involved, as part of a multi-disciplinary team, with producing and managing, both the pre-feasibility and feasibility

underground mining transition

Optimising Open Pit to Underground Cut over . Snowden Mining. Apr 5, 2018 . As the underground mine operates at a higher cut off grade than the . to consider in the open pit to underground transition point optimisation. Contact US Move Underground Slows Stornoway, Ends Q2 with $27M Loss . Aug 14, 2018 . Canadian miner Stornoway Diamonds reported a net loss of . as the transition to underground

Expertise Burnt Shirt

Jeremy prepares and presents Snowden’s Technical Development training courses, including Open Pit Mine Design, Mine Contracts, Mine Finance, Mining for Executives and introductory geology, mining and metallurgical courses in addition to his consulting work and lectures in a guest capacity at the Western Australian School of Mines. Contact us . PO Box 314 Northbridge WA 6865 +61 437 408 942

A probabilistic model to improve reconciliation of

Many of the open-pit mines suffer from the lack of reconciliation between estimated and actual grades. In a mining operation, grade reconciliation is the comparison between the values of the estimated grade calculated in exploration stage and the actual grade obtained from more reliable data such as blast holes’ samples. Many different factors affect the degree of reconciliation in a mining

Strategic mining options optimization:Open pit mining

Near-surface deposits that extend to considerable depths are often amenable to both open pit mining and/or underground mining. This paper investigates the strategy of mining options for an orebody using a Mixed Integer Linear Programming(MILP) optimization framework. The MILP formulation maximizes the Net Present Value(NPV) of the reserve when extracted with(i) open pit mining,(ii) underground

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