For silver the more important deposits commercially are such compounds as the minerals tetrahedrite and argentite (silver sulfide, Ag 2 S), which is usually associated with other sulfides such as those of lead and copper, as well as several other sulfides, some of which contain antimony as well.
France is the most visited European nation with 83.7 million international tourist arrivals in 2014. Established in the late 1700s, the Louvre Art Museum in Paris is one of the most frequented tourist sites in all of France. Europe is a fascinating continent, and it attracts millions of tourists annually.
Not only will the country be celebrating its 150th birthday, but it will also potentially welcome an influx of tourists. Canada was recently named Lonely Planet's number one travel destination of the year for 2017, followed by Colombia and Finland in second and third place, respectively. DON'T MISS: 10 jaw-dropping photos of the Canadian Rockies.