Joe and Shirley Tellam were tending to their own loved one’s Greenwood Cemetery gravesite when Shirley was struck by a separate section of the cemetery that needed some serious TLC. Burial plots bearing the names of families hailing from Cornwall, England — the origins of many of the miners who once made Grass Valley the heart of the gold industry, were covered by several seasons of fallen leaves and pine needles, along with overgrown brush and tree limbs. “I was so happy to cut bushes and clean there because Joe’s family is from Cornwall, England,” Shirley said. She didn’t set …