12/29/2022 0 Comments Gravity circuit gold miningHigher capex and potential operational complexity." Possibly lower grinding costs with a coarser primary grind.įlexibility to treat lower gold grade feed to POX/CIL and recover gold from lower grade ore zones of the deposit Higher gold recovery by allowing for higher mass pull in flotation. The main advantage/disadvantages of the float/POX/CIL option are: Potential risk on gold losses to custom smelting charges. Lower gold recovery in flotation when making a high-grade concentrate for sale to a smelter (reduce shipping costs etc). Lower capex and simpler operation by avoiding POX/CIL etc. The main advantage/disadvantages of the float and flog option are: Commenting on these potential products, and potential trade-off studies, is Chris Fleming, Senior Consultant at SGS stated: These results provide Gold Terra with two potential product paths for Yellorex mineralization, either to produce a saleable concentrate, or to produce gold on site through the POX process. The high-grade composite gold recovery in the sulphide concentration of the gravity tails reported 93% gold recovery with 98.8% recovery in POX within 24 hours. Preliminary results of this initial testwork is very encouraging, with a combined total gold recovery of POX and cyanide leach of the sulphide concentrate of 92.1% in the high-grade composite samples. Overall recovery means including gravity, flotation, regrind, pressure oxidation, and cyanide.įlotation rougher concentrate with a recovery of 95% for the high-grade composite graded up to 41 g/t Au with approximately up to a 7.0 % sulphide component. #Gravity circuit gold mining freeNerco, with selective free milling ores, achieved up to 95% recovery, while Miramar Mining increased the throughput from 800 ton per day (tpd) to 1400 tpd and achieved 88 to 90% recovery by mixing free milling ore with refractory ore after the acquisition from Nerco in 1993.Ĭonditions that prevailed for current testwork are as follows: 30% solids (w/w), 1 gram/liter NaCN (cyanide), pH between 10.5 and 11.0 dissolved oxygen between 8-9 ppm 24 hours retention time, and 4 grams of carbon added. In the more recent years (1987-2003), the former Con Mine operated with a flow sheet including a gravity circuit, a flotation circuit, follow by a Pressure Oxydation (POX) Circuit, or autoclave. Historically gold mineralization encountered at shallower depths in the mine (generally above 1000m) was likely refractory gold, while deeper mining was free-milling gold, hence a gravity circuit was added by Nerco in 1989. The Con mine (1938-2003) produced over 6M oz of gold over more than 50 years mine life. Produce gold on site through the POX process Results provide Gold Terra with two potential product paths for Yellorex mineralization either to: Total gold recovery of 92.1% achieved in our first testwork in the high-grade composite samples of 10 g/t Au, after flotation concentrate, pressure oxidation (POX), and cyanide leach.Įxcellent gold assays reporting up to 98.8% of gold in the flotation concentrate with close to 7% sulphide content. The Yellorex zone is adjacent to the Company's 100% owned Yellowknife City Gold project (the YCG Project"), Northwest Territories. The Yellorex zone is located approximately two (2) kilometers south of the former producer, the Con Mine, which is under option from Newmont Corporation (the "Con Mine Option Property"). (TSXV:YGT)(Frankfurt:TX0)(OTCQX:YGTFF) ("Gold Terra" or the "Company") is pleased to announce excellent gold recovery from its initial metallurgical tests on the Yellorex zone part of the Campbell shear. VANCOUVER, BC / ACCESSWIRE / Aug/ Gold Terra Resource Corp.
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