developments in the united states had been less than spectacular. butters's failures, as well as others, was followed after 1904, with scotsman stanley macquisten's process (a surface tension based method), which was developed with a modicum of success in nevada and idaho, but this would not work when slimes were present, a major fault. henry e. wood of denver had developed his flotation process along the same lines in 1907, patented 1911, with some success on molybdenum ores. for the most part, however, these were isolated attempts without fanfare for what can only be called marginal successes.