Dean Caldwell of Cicero has been mining opal and obsidian for six months of the year in Mexico for the last 15 years. Last year, he pulled an opal out of the side of a mountain that weighs in at 1,253 ...

When he’s not putting his Microsoft expertise to use, Adelaide-based MVP Daniel Brown has another passionate project – opal mining. With his launch of a new tool OpalAI, he has managed to combine his ...