source: Prospectors from California, Europe and China were also digging along the Peel River and up the mountain slopes.
target: Prospectors from California, Europe and China were digging along the Peel River. They also were digging up the mountain slopes.
references: Prospectors from California, Europe and China were digging along the Peel River. They also were digging up the mountain slopes. Californian, European and Chinese prospectors dug along the Peel River and mountain slopes. People from all over the world  were  digging along the Peel River and up the mountain. Lawyers from California, Europe and China were also looking along the Peel River and up the mountain slopes. Diggers from California, Europe and China were also digging along the Peel River and up the mountain slopes. Californian, European, and Chinese prospectors were also digging along the Peel River and up the mountain. Gold diggers from California, Europe and China dug along the Peel River.  They also dug up the mountain slopes. Gold miners from California, Europe, and China were also digging along the Peel River and up the mountain slopes. Prospectors from California, Europe, and China were digging beside the Peel River and up the mountain slopes. People from California, Europe and China dug along the Peel River and up mountains.