Usage Study Confirms Exceptional Yield Of Premium Outputs

Eagle Graphite is pleased to provide an update to shareholders and stakeholders as to its progress and plans with respect to the ongoing graphite usage study.


  • Starting with a representative sample of run-of-plant 95 wt%C graphite, processing was carried out to upgrade the graphite for premium applications.

  • Usage of a simplified processing stream generated high yields of graphite suitable for lithium-ion batteries. The process also co-generated other high-purity graphite outputs with excellent qualities for other high specification graphitic products.

  • Combined, the resultant high value outputs make up 86% of the mass of the inputs, which compares favourably to an estimated 35% typical for the industry.

  • The wide range of potentially suitable premium applications includes lithium-ion batteries, conductivity enhancements, pigmentation additives, and non-rechargeable batteries.

A leading independent specialist laboratory is under engagement to optimize process and qualify graphite produced at our Black Crystal plant for high value markets. The research will continue through 2018. The Company has received confirmation of potential applicability of our graphite for a wide range of high value markets.

During this part of the study, a series of processing steps isolated several different outputs. Each output has distinct characteristics determining its suitability for a specific set of high value applications. Common to all outputs, apart from removed impurities, is a very high purity level at or above 99.98 %wtC. Careful measurements of input and output masses at each processing stage allowed for accurate estimates of proportions available to each family of applications.

The high level overview of potential allocations by product category is indicated below.


Mass per 100 kg input1

Example Applications

Lithium-ion anode graphite2

37.5 kg

Electric vehicles

Expanded/delaminated graphite

27.1 kg

Cathodes for alkaline and nickel-iron batteries, food grade plastics

Other premium applications combined

21.5 kg

Conductivity enhancers, specialty pigments

Impurities removed during purification

5.0 kg

Beyond scope of study3

Graphite not recovered for high value applications4

8.8 kg

Standard pencils and lubricants


100.0 kg

For lithium-ion battery anodes, current industry practice is to mill and spheronize graphite concentrate prior to purification with hydrofluoric acid (HF). Typical yield of anode graphite from this process is 35%, with the remaining graphite relegated to low value markets such as pencils and carbon raisers.

The process applied to Black Crystal confers significant advantages. The processing stream that can be applied to graphite from Black Crystal for lithium-ion anode graphite yields quantities within battery specifications that are substantially higher than industry standard (53% vs. 35%). Further, the non-HF process preserves most of the remaining graphite as high purity material suitable for other premium applications.

Eagle Graphite CEO Jamie Deith states “Our graphite usage study is showing that with a simplified, environmentally friendly process, we can achieve high yields of high value products and potentially meet client requirements across a broad range of premium applications. Our next steps to the study involve further testing for battery applications, and we hope that we continue to exceed quantitative targets for high purity graphite for advanced material suitability.”

Torey Marshall, Eagle’s EVP of Business Development, adds “The proposed approach to creating products from Black Crystal graphite could result in an extremely high value combination of outputs per raw ton of graphite produced from our plant. We can pursue a range of premium products without sacrificing the usually high proportion of output to low value by-products typical of graphite producers.”

1Source material is run-of-plant flake graphite concentrate 95 wt%C, approximating historical production at Black Crystal.

2“Lithium-ion anode graphite” refers to flake graphite that is spheronized, purified, and sized to match or exceed typical specifications of lithium-ion battery manufacturers. Not all of the starting graphite concentrate was allocated to the lithium-ion anode graphite processing stream. The starting concentrate included approximately 30% coarse flakes which can be allocated to potentially more lucrative applications. The 70% of input concentrate used to target lithium-ion anode yielded of 53.5% of input as lithium-ion anode graphite, corresponding to 37.5 kg per 100 kg of total input concentrate.

3Impurities indentified include a number of potentially recoverable elements, including silicon, calcium, and trace quantities of silver and yttrium. Recovery of these is beyond the scope of the current study.

4Graphite not recovered for high value applications consists primarily of left over graphite after milling, expansion, or purification that is not captured for a particular high value application. This material remains suitable for non-premium applications such as pencils or general lubricants.

5Total differs from the sum of individual entries due to rounding.

Torey Marshall, BSc (Hons), MSc (Geology), MAusIMM(CP), a “Qualified Person” as defined by NI 43-101, has reviewed and approved the scientific and technical information in this release.

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