This list of ores classified as natural and rare gold minerals are refractory to process. All these are sulphides refractory gold bearing minerals and will have a poor response behaviour to usual cyanidation extraction methods, and for the little guy, best used for exhibit or sold to rock collectors on eBay.

 Native Gold Au Formula
 MuthmanniteVery Rare Crystal.  Yellow white, opaque; Perfect Cleavage. Mohs 2.5-3.5; SG 7.5-8
Dana number: 442
AgAuTe
 Montbrayite Rare telluride, and it contains ~ 50 wt% Au (Au,Sb)2Te3
 PetzitePetzite Ag3AuTe2
 Rhodite Naturally occurring alloy of gold and rhodium with an SG of 15.5 – 16.8 AuRh
 Iridic GoldNatural alloy of gold and iridium containing 62% gold, 30% iridium, 4% platinum, and 2% silver. AuIr
 Electrumelectrum

Hardness: 2.5-3 and Density: 12.5-15.5

 AuAg
 Cuproauride (Tetra-auricupride)Cuproauride_(Tetra-auricupride) AuCu
 Porpezite (palladium)PorpeziteNatural gold alloy containing 5-10 wt % Pd Au,Pb
 Bismuthian Gold White AuBi
 FishchesseriteFishchesseriteOpaque, Pale pink in reflected light, Metallic luster Ag3AuSe2
Aurostibite (antimonides)Aurostibite AuSb2
 UytenbogaardtiteUytenbogaardtite Ag3AuSb2
 Gold Tellurate Deadly Rare. UFO RareAu(HTeO4)3
 KostoviteKostovite AuCute4
 NagyagiteNagyagite Pb5Au(TeSb)4S5-8
 Syvanite Sylvanite AuAgTe4
 KrenneriteKrennerite_001 AuAgTe2
 Calaverite (gold telluride)calaverite AuTe2
 RozhkoviteRozhkovitaPalladian variety of Auricupride (Cu,Pb)3Au2
 MaldoniteMaldonite_rock

SG 15.5 with Hardness of 1.5-2

 Au2Bi
 AuricuprideAuricupride AuCu3
 Amalgan Also very rare Au2Hg3(x)

http://www.timerock.com/library/minerals/minerals_sulfides.php

http://www.mindat.org

http://www.dakotamatrix.com/mineralpedia/8175/sylvanite

http://nevada-outback-gems.com/mineral_information/Electrum_mineral_info.htm

http://www.surreyminerals.com/

http://www.mineralman.com/

http://hyperphysics.phy-astr.gsu.edu/

http://museum.wa.gov.au/research/collections/earth-and-planetary-sciences/mineral-collection/calaverite-gold-telluride