Question: who discovered gold in the sierra nevada of california
[{'answer': 'James W. Marshall', 'provenance': [{'wikipedia_id': '58296', 'title': 'California Gold Rush', 'start_paragraph_id': 1, 'start_character': 87, 'end_paragraph_id': 1, 'end_character': 104, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '58296', 'title': 'California Gold Rush', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 808, 'bleu_score': 0.6852387887520951, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17422959655235419544}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '58296', 'title': 'California Gold Rush', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17422959655235419544}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2930359', 'title': 'Marshall Gold Discovery State Historic Park', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ["Marshall Gold Discovery State Historic Park is a state park of California, United States, marking the discovery of gold by James W. Marshall at Sutter's Mill in 1848, sparking the California Gold Rush. The park grounds include much of the historic town of Coloma, California, which is now considered a ghost town as well as a National Historic Landmark District. The park contains two California Historical Landmarks: a monument to commemorate James Marshall (#143) and the actual spot where he first discovered gold in 1848 (#530). Established in 1942, the park now comprises .", "Marshall Gold Discovery State Historic Park is a state park of California, United States, marking the discovery of gold by James W. Marshall at Sutter's Mill in 1848, sparking the California Gold Rush.", "Marshall Gold Discovery State Historic Park is a state park of California, United States, marking the discovery of gold by James W. Marshall at Sutter's Mill in 1848"]}}]}, {'provenance': [{'wikipedia_id': '58296', 'title': 'California Gold Rush', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ["The California Gold Rush (18481855) began on January 24, 1848, when gold was found by James W. Marshall at Sutter's Mill in Coloma, California. The news of gold brought approximately 300,000 people to California from the rest of the United States and abroad. The sudden influx of gold into the money supply reinvigorated the American economy, and the sudden population increase allowed California to go rapidly to statehood, in the Compromise of 1850. The Gold Rush had severe effects on Native Californians and resulted in a precipitous native population decline from disease, genocide and starvation. By the time it ended, California had gone from a thinly populated ex-Mexican territory, to having one of its first two U.S. Senators, John C. Frémont, selected to be the first presidential nominee for the new Republican Party, in 1856.", "The California Gold Rush (18481855) began on January 24, 1848, when gold was found by James W. Marshall at Sutter's Mill in Coloma, California.", ", when gold was found by James W. Marshall at Sutter's Mill in Coloma, California."]}}]}, {'provenance': [{'wikipedia_id': '202195', 'title': 'James W. Marshall', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ["James Wilson Marshall (October 8, 1810 August 10, 1885) was an American carpenter and sawmill operator, who reported the finding of gold at Coloma on the American River in California on January 24, 1848, the impetus for the California Gold Rush. The mill property was owned by Johann (John) Sutter who employed Marshall to build his mill. The wave of gold seekers turned everyone's attention away from the mill which eventually fell into disrepair and was never used as intended. Neither Marshall nor Sutter ever profited from the gold find.", 'James Wilson Marshall (October 8, 1810 August 10, 1885) was an American carpenter and sawmill operator, who reported the finding of gold at Coloma on the American River in California on January 24, 1848, the impetus for the California Gold Rush.', 'James Wilson Marshall (October 8, 1810 August 10, 1885) was an American carpenter and sawmill operator, who reported the finding of gold at Coloma on the American River in California on January 24, 1848']}}]}, {'provenance': [{'wikipedia_id': '36821', 'title': "Sutter's Mill", 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['On January 24 1848, James Wilson Marshall, a carpenter originally from New Jersey, found flakes of gold in the American River at the base of the Sierra Nevada Mountains', 'On January 24 1848, James Wilson Marshall, a carpenter originally from New Jersey, found flakes of gold in the American River at the base of the Sierra Nevada Mountains']}}]}]