Citation mining executes automated, grounded prompts across major models such as Google Gemini, OpenAI ChatGPT, and Anthropic Claude to map how AI engines source factual claims. The system captures every grounding URL received during retrieval, splitting them into selected citations that directly support generated answer segments and unselected sources that were browsed but dropped from the final output. In parallel, it harvests background fan-out search queries and computes domain citation shares, highlighting content gaps and competitive deficits to guide targeted page rewrites in the Content Optimizer.