Australia’s gold mines by production, grades and costs... Part 1

By Trevor Hoey. Published at May 22, 2019, in Investor 101

PCF Capital Group, a provider of corporate advisory services to the mining and resource sector, has released a report, highlighting current gold all in sustaining costs (AISC) for Australian and New Zealand gold operations.

While we provide profiles of high performing mines and companies featured in the report, it is important to gain a thorough understanding of what makes up AISCs, and how important this metric can be especially during periods of commodity price volatility.

AISCs are the costs attributed to production at operating mines, and they are an important focus in gauging a project’s commercial viability. It is important to note, that they don’t include the costs such as building a plant and establishing the infrastructure required to bring a mine into production, commonly referred to as upfront capital expenditure (CAPEX).

AISC is a similar measure to what you might find in anything from manufacturing to retail, only in other sectors acronyms such as CODB (cost of doing business) and COGS (cost of goods sold) are applied.

Because the mining industry is subject to unpredictable and uncontrollable commodity price movements, AISC’s costs are what some mines live and die by.

For example, a marginal gold producer that has AISCs of US$1200 per ounce is sailing close to the wind based on the current gold price of around US$1280 per ounce.

On balance, such a company would be much more prone to significant share price volatility in the event of commodity price weakness than a stock with lower costs of production.

Scale, grades, processing costs, open pit vs underground

The interesting aspect of the AISC metric is the number of factors that feed into the final figure, and similar to any other sector costs, they can vary from month to month and year to year.

In the case of gold stocks, better grades usually translate into lower cost mines.

Open cut mines are normally cheaper to operate than underground mines.

Open cut mines are generally cheaper to operate.

Different treatment processes that may be required because of the composition of the mineral or the amount of ‘waste’ that needs to be separated to extract the ore also impact the cost of the end product.

Factors such as these can impact decisions such as the economic viability of mining higher grade ore at lower depths where the potential revenue generation is weighed up against the increased mining and processing costs.

Production volumes also feed into the end result with the increased revenues from large-scale production proportionately decreasing the fixed operating costs of running a plant.

Exchange rates don’t feed directly into AISCs

As an adjunct, we’ve spoken before about the impact of foreign exchange rates, in particular the advantages currently being experienced by Australian gold producers.

While this isn’t a metric that necessarily comes into play in calculating AISCs as foreign exchange rates impact the top line, it does become a significant factor where companies benefit from the sale of by-products.

Simplistically, a mine operating in the US generates revenues of about US$1280 per ounce based on the current spot price, whereas an Australian mine based on an unhedged sale price is receiving $1850 per ounce in Australian dollars.

Suffice to say that the cost components of the mine operating in Australia will be impacted by wages and contracting outgoings paid in Australian dollars.

By-products drive down costs of production

The lowest cost mines generally have one factor in common - they are multi-commodity producers that benefit from by-product credits which reduce the costs of production.

For example, in the gold sector, the by-product is quite often copper.

As a case in point, a mine that produces 100,000 ounces of gold and 10,000 tonnes of copper per year at a cost of US$1000 per ounce, not including revenues generated from the sale of copper, will have AISCs well below US$1000 per ounce after the by-product credits are taken into account.

With the copper price hovering in the vicinity of US$6000 per tonne, revenues from the sale of 10,000 tonnes could be in the order of $60 million.

Using back of the envelope figures, this could reduce the AISC at the 100,000 ounce mine from $100 million per year to $40 million per year, reducing AISCs to US$400 per ounce.

This would effectively provide the producer with a healthy margin of approximately US$900 per ounce at today’s rates, making it a much more economical mine given a standalone gold operation would only be delivering a margin of about US$300 per ounce.

Of course, in the case of an Australian producer the cost of production offset would be in the order of $8700 per tonne of copper ($87 million based on production of 10,000 tonnes per annum) because of the favourable AUD:USD exchange rate.

The cream of the crop

Below is an excerpt from PCF’s report on the lowest operating cost mines, which goes on to discuss the 10 most economical gold producing operations in more detail.

The report also ranks projects by production size and grades, providing further perspective in terms of economic viability.

This is only an overview of a much more comprehensive report, but it provides an interesting insight into the operations of companies of all sizes with one notable performance being an AISC of, believe it or not, negative $510 per ounce.

It also highlights some of the aforementioned contributing factors we referred to - bear in mind the current spot price is approximately US$1280 or AU$1850 based on an AUD:USD exchange rate of 68.8 cents.

Overview - AISC

The average All-in Sustaining Cost (AISC) for Australia and New Zealand was A$1,255/oz, which is up 7.3% (A$85/oz) on the previous quarter average AISC of A$1,170/oz.

Evolution Mining’s (ASX:EVN) part of the Ernest Henry operations was the lowest cost producer reporting an AISC of A$-510/oz followed by Newcrest’s (ASX:NCM) Cadia Valley operations with an AISC of A$206/oz, then by Kirkland Lakes' (ASX:KLA) Fosterville mine (A$442/oz).

The average gold spot price for the quarter was A$1,830/oz (US$1,304/oz).

It should be noted that Ernest Henry and Cadia Valley benefit from significant base metal by-products.

Aurum Analytics’ estimate of these operations AISC on a co-product basis (CoAISC) is as follows;

Ernest Henry Co-AISC of A$732/oz and Cadia Valley Co-AISC of A$706/oz.

The lowest cost “gold only” operations were Kirkland Lakes' Fosterville mine with an AISC of A$442/oz, then Westgold Resources' (ASX:WGX) Fortnum mine (A$937/oz) and Newmont's (NYSE:NEM) Tanami mine (A$953/oz).


Newcrest’s Cadia Valley operation took out top spot as Australia’s largest gold producer with 218,891 oz for the quarter, followed by Newmont's Boddington (155,000 oz) then Newmont's Tanami operation (131,000 oz).

Of the mines where gold is a by-product, Oz Mineral’s (ASX:OZL) Prominent Hill produced the most gold 32,947 oz followed by BHP's (ASX:BHP) Olympic Dam with 28,609 oz and Evolution's part of Ernest Henry 22,419 oz.


Grade wise, for the companies that report AISC, the average reported mill head/feed grade was 3.47 g/t (Open Pit (OP) - 1.71 g/t, Underground (UG) – 5.33 g/t, Open Pit and Underground (OP/UG) - 2.35 g/t) which was down on the previous quarter, 3.91 g/t (-11.3%).

Kirkland Lake’s Fosterville mine again took out the honour as the operation with the highest average feed grade with 29.00 g/t, followed by St Barbara’s (ASX:SBM) Gwalia mine 11.50 g/t.

The lowest grade mine was Evolution’s Ernest Henry processing an average head grade of 0.56 g/t.

The high-grade operations that do not report an AISC were AuStar Gold's (ASX:AUL) Morning Star mine with 10.26 g/t and Mandalay Resources’ (TSE:MND) Costerfield mine with 5.00 g/t.

By-products boost the bank at Ernest Henry

Evolution Mining Ltd’s Ernest Henry mine clearly demonstrates the benefits of by-product credits.

While March quarter production of 22,400 ounces at a very low head grade looks underwhelming on the surface, the production of 4800 tonnes of copper was instrumental in the group generating record net mine cash flow of approximately $60 million in the quarter.

For the record, the company sold nearly 4600 tonnes of its copper production at Ernest Henry at a price of approximately AU$9260 which implies sales revenue of $42.6 million.

Next-generation low-cost miners

One of the factors this report indicates is that companies don’t have to be large to generate robust profits and returns on capital invested.

It is all about the multiple ingredients that go into producing a product that generates optimum financial returns for investment.

While PCF focused on producing mines, tomorrow Finfeed will be examining emerging players that have the potential to develop mines with a high return on capital invested.

In doing this we will examine early indicators such as grades, resource size, vicinity of mineralisation to surface and the prospect of generating income from by-products.

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S3 Consortium Pty Ltd (CAR No.433913) is a corporate authorised representative of LeMessurier Securities Pty Ltd (AFSL No. 296877). The information contained in this article is general information only. Any advice is general advice only. Neither your personal objectives, financial situation nor needs have been taken into consideration. Accordingly you should consider how appropriate the advice (if any) is to those objectives, financial situation and needs, before acting on the advice.

Conflict of Interest Notice

S3 Consortium Pty Ltd does and seeks to do business with companies featured in its articles. As a result, investors should be aware that the Firm may have a conflict of interest that could affect the objectivity of this article. Investors should consider this article as only a single factor in making any investment decision. The publishers of this article also wish to disclose that they may hold this stock in their portfolios and that any decision to purchase this stock should be done so after the purchaser has made their own inquires as to the validity of any information in this article.

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