Miners are the “best buying opportunity in 30 years” owing to their attractive valuations, according to Adrian Day, CEO of Adrian Day Asset Management, but investors should still aim for quality, which is not necessarily linked to size, he said. “Don’t buy a hamburger when the fillet’s on sale,” Day said, quoting Rick Rule, president and CEO of Sprott. “The problem in the mining business is figuring out what the filet is because frankly, size doesn’t necessarily equal quality. So, at this point because everything is cheap, I would certainly be focusing on what I regard as the better quality companies, including the larger companies, even if some of the juniors look cheaper,” Day told Kitco News on the sidelines of the Precious Metals Summit in Beaver Creek.