Gold has surged to historic highs, fueling a new boom in Western Australia’s goldfields. Mining companies like Horizon Minerals are cashing in on $5,000-an-ounce prices, but investors haven’t forgotten past cycles where miners overspent and underdelivered. This time, companies promise discipline — share buybacks, dividends, and cautious expansion — even as rising costs and global uncertainty put pressure on the industry. Bloomberg’s Paul Allen reports for “Wall Street Week.”