There are several advantages and disadvantages to using flotation for gold extraction, which I can outline below:

Advantages:

- Flotation can be used to extract very fine particles of gold, which may not be recoverable using other methods.

- Flotation is a relatively low-cost method of gold extraction, as it does not require the use of expensive reagents or high energy inputs.

- Flotation can be used to extract gold from a wide range of ore types, including those that are refractory or difficult to process using other methods.

Disadvantages:

- Flotation relies on the use of chemicals, such as collectors and frothers, which can be expensive and may have environmental impacts if not managed properly.

- Flotation can be sensitive to changes in the mineralogy of the ore, which can affect the efficiency of the process.

- Flotation can produce a concentrate that contains other minerals, which may need to be further processed or treated to extract the gold 

Overall, flotation is a useful method for gold extraction, but it is not without its drawbacks. As with any method of gold extraction, it is important to consider the specific characteristics of the ore and the potential impacts of the extraction process on the environment.