Agent86Here are links to some documents, more or less...

Agent86

Here are links to some documents, more or less relevant.
http://www.intracen.org/btp/wtn/wtn_country_papers/montenegro_cp.pdf

http://minerals.usgs.gov/minerals/pubs/country/1999/9435099.pdf

taken from http://geography.about.com/library/cia/blcserbia.htm
(Natural resources: oil, gas, coal, iron ore, bauxite, copper, lead, zinc, antimony, chromite, nickel, gold, silver, magnesium, pyrite, limestone, marble, salt, hydropower, arable land )

For now, I found no direct reference regarding potash.