Question: what was discovered in 1870 in the black hills that brought many new settlers to the territory
[{'answer': 'Gold', 'provenance': [{'wikipedia_id': '7244144', 'title': 'Black Hills Gold Rush', 'start_paragraph_id': 0, 'start_character': 12, 'end_paragraph_id': 0, 'end_character': 16, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '7244144', 'title': 'Black Hills Gold Rush', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 157, 'bleu_score': 0.9321022168949711, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9543458402531241099}, 'section': 'Section::::Abstract.'}]}]