The efficiency of flotation compared to other gold extraction methods depends on several factors, including the characteristics of the ore, the type of deposit, and the specific extraction method used. In some cases, flotation may be more efficient than other methods, while in other cases, it may be less efficient.

For example, some types of gold deposits, such as refractory gold ores, are difficult to process using traditional cyanide leaching methods. In these cases, flotation may be a more efficient method of gold extraction, as it can help to recover gold particles that are not readily amenable to cyanide leaching.

On the other hand, some types of gold deposits may be better suited to other methods of extraction, such as gravity concentration or heap leaching. Gravity concentration can be particularly efficient for coarse gold particles, while heap leaching can be a low-cost method for extracting gold from large low-grade deposits.

Overall, there is no one-size-fits-all answer to the question of which gold extraction method is most efficient, as it depends on a variety of factors specific to each deposit. As such, it is important to carefully evaluate the characteristics of the ore and the potential benefits and drawbacks of each extraction method before deciding which method to use.