Many biographies of Christians begin at the point of the subject's conversion, with little attention paid to the preceding years. The emphasis of this book is different. As God has chosen his people before the beginning of time his interest with them does not begin at conversion. Gold from dark mines focuses on the pre-conversion years of its six subjects and how they came to faith. After telling their life stories in brief each section is concluded by showing how God used the experiences they went through before conversion to achieve what he did in their lives.