Sphinx Mining Systems

Sphinx Mining Systems LLC is the consulting practice of Kwame Awuah-Offei, PhD, PE. Sphinx helps clients achieve their business goals by helping publicly traded mining companies provide compliant and meaningful disclosure regarding their mining properties. Sphinx also provides decision-making support through the application of modeling, simulation, and optimization to mining systems. We will work with your staff or independently to provide technical support and help you make better business decisions so you will have more sustainable and profitable mines. We also provide mine planning services for improving efficiency or for feasibility studies.

Property disclosure
Engineering & process improvement
Mine planning & design


RE: On the connection between mine feasibility studies, valuation, and impairment analysis

In November 2021, I posted a blog post about the connection between feasibility studies, valuation, and impairment analysis. I recently came across a comment letter by SEC staff that, I believe illustrates this connection. In this post, I wanted to quickly point out how this comment letter illustrates this connection and the fact that the …

On the connection between mine feasibility studies, valuation, and impairment analysis

Most mining engineers are taught how to do mine feasibility studies in school but not all are familiar with property valuation and impairment tests. However, valuation and impairment analysis are also key aspects of the mining business that mining engineers should familiarize themselves with as they develop in their careers. In this post, I’m going …

Implications of mining project cost overruns for QP liability

Cost overruns are not new to engineering projects. It is a problem when the scale and frequency is high. Unfortunately, the mining industry has a reputation for cost overruns during project construction. Different people have estimated mining cost overruns to nearly 40%. This is significant because all the CRIRSCO standards require capital and operating cost …


  • Mineral Property Disclosure