Question: when was the first piece of gold found in australia
[{'answer': '1851', 'provenance': [{'wikipedia_id': '30865472', 'title': 'Australian gold rushes', 'start_paragraph_id': 1, 'start_character': 233, 'end_paragraph_id': 1, 'end_character': 237, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '30865472', 'title': 'Australian gold rushes', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 559, 'bleu_score': 0.980097014099621, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10385651987725694917}, 'section': 'Section::::History of discovery.\n'}]}]