Recently I am studying junior companies and what characterizes them to be considered junior companies. However, a specific sector left me with a certain doubt and desire to know, which is the gold mining sector, so, after all, what are the criteria that classify a company in the gold industry, and who are the junior gold miners? After researching several websites and talking to several experts in the field, both online and in-person, I came to the following conclusion: A junior gold mining company is an exploration company looking for new deposits of gold or other precious metals like silver, uranium, etc. Most junior gold mining companies are companies that are developing and starting exploration and are looking for land that is most likely to have large deposits.Knowing what junior gold miners are, what actions and measures can we take from this, especially as investors?Being investors we can have a great chance in this scenario as junior gold miners are one step away from becoming a big company and investing in the company when it is just a junior company can bring the investor high profits. However, the investor must investigate and seek to know about the junior company that he is going to invest in and know how to differentiate between a legitimate company ready to get rich and a company with no future.Another important factor to know what a junior gold mining company is is to check the company’s resources, in addition to checking the proximity to gold production and whether there is an amount of gold discovered in recent years. The advantage of investing in junior miners is that they usually have a large growth capitalization in addition to having stocks with a very low value at the beginning, in the penny house. That said, all investors should at least consider investing in junior gold miners or at least consider them shortly.