Question: when did the expansion of the gold mines take place in the east rand
[{'answer': '2008', 'provenance': [{'wikipedia_id': '8514097', 'title': 'East Rand Mine', 'start_paragraph_id': 1, 'start_character': 231, 'end_paragraph_id': 1, 'end_character': 235, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '8514097', 'title': 'East Rand Mine', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 468, 'bleu_score': 0.9009851347324901, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18245733320534017417}, 'section': 'Section::::Abstract.'}]}]