The townships of Bald Hills (later renamed Hill End) and Tambaroora emerged when gold was discovered there shortly after the rush to Ophir. For the first time, reef gold was extracted, and a battery stamper was brought from England to Bald Hills. Tens of thousands of people poured into Tambaroora and Hill End through the 1870s. Significant townships with substantial commercial buildings, hotels and churches grew up. During this boom time, Bernard Otto Holtermann discovered the largest single gold nugget of reef gold found anywhere in the world. It measured 4 feet 2 inches in height, 2 feet 2 inches in width and had an average thickness of four inches. It was valued at 12,000 pounds, a phenomenal sum at the time.