Sunrise Resources said it had gleaned positive test results at its CS Pozzolan-Perlite project in Nevada.
Tests on the company's pozzolan show that the product mitigates the negative impact of concrete cancer.
The company had now received independent certification testwork results for three composite samples of its natural pozzolan demonstrating its effectiveness.
"This is a very important milestone in our testwork," chief executive Patrick Cheetham said.
"The CS pozzolan was tested using some of the most reactive aggregates known in the western USA."
At 1:49pm: (LON:SRES) Sunrise Resources PLC share price was +0.01p at 0.16p