At Radius Gold's Maricela project, geologists have mapped and sampled an epithermal silver & gold mineralized vein system extending approximately 1.5km long by 300m wide, within which occurs multiple veins, stockworks and breccias (Figure 1). Vein intersections have exposed widths of up to 25 meters. Radius Gold has collected 362 rock chip samples which returned values from below detection to highs of 12.75 g/t gold and 2890 g/t silver and various continuous chip sampling across the structures which include highlight intervals of:
- 3m at 4.46 g/t gold and 1335 g/t silver - Baby Gloria Vein
- 6m at 1.03 g/t gold and 417 g/t silver - Silver Central Vein
- 25.3m at 0.31 g/t gold and 62 g/t silver - (intersecting veins)
The Maricela property shows no evidence of previous drilling or systematic exploration. The property has a number of small open pits and shafts where historically high grade material was mined in the 1950's and 1960's and shipped to a processing plant in Cananea. The Mexican geological survey conducted a small sampling program (24 samples) in 2000, and since then no significant work has been completed. The Project has excellent infrastructure and good road access.
The Maricela project is located within a prolifically mineralized mining district, 20km south of the Cananea mine, one of the world's largest open pit copper mines (Figure 2). The Arizona - Sonora porphyry belt is one of the most important centres of copper mineralization on Earth. Spatially and genetically related to this giant porphyry trend are numerous epithermal gold and silver deposits. Silvercrest Metals' Las Chispas discovery is located 50km south of Maricela. Las Chispas is a low sulphidation epithermal silver and gold deposit estimated to be amongst the highest grade primary silver deposits in the world. Other significant mines within an 80km radius of Maricela include, Santa Elena silver gold mine (First Majestic Silver), Nacozari copper mine (Groupo Mexico), Mercedes gold mine (Premier Gold Mines), Maria copper mine (Minera Frisco).
The mineralization at Maricela consists of a series of intersecting epithermal vein systems and associated vein stockworks and breccias that have potential for a bulk tonnage open pit deposit as well as high grade underground vein targets. Radius geologists have conducted extensive mapping and rock chip sampling and have found that the system is open for expansion. See Figure 3 for the Maricela Vein system.
The main vein, Virgin de Plata, strikes NW-SE and has been defined for approximately 1km. Virgin de Plata is intersected by at least 4 veins (striking NE-SW) forming a horse tail structure of intersecting veins. The veins are generally between 1 and 3m wide of massive quartz with mineralized stockworks and brecciated vein selvages, extending commonly +10m across the vein zones. At intersections, larger stockwork zones are observed with zones up to 25.3m grading 0.31 g/t gold and 62 g/t silver. The mineralization type is a low sulphidation silver gold epithermal vein system hosted within an andesite volcanic sequence. The andesite sequence is intruded by a quartz-monzonite porphyry that is exposed just north, and west of the veins in an uplifted block (Figure 4, Figure 5 & Figure 6).
Maricela silver sold geochemistry
Radius completed mapping and collected 362 rock chip samples which range from below detection to 12.75 g/t gold and 2890 g/t silver.
Radius has taken multiple chip channel sample sections across the veins, stockworks and breccias where outcrops allow. Massive quartz veins constitute the higher grades while veinlet breccias in between the veins and in the wall rock are also variably silver and gold mineralized.
Chip channel sample sections on the Maricela vein structures.
Vein zone Width (m) Au (g/t) Ag (g/t) Baby Gloria 3 4.46 1335 Virgin de Plata & Baby Gloria 25.3 0.31 62 Baby Gloria 22 0.15 39 Baby Gloria 5 0.33 127 Baby Gloria 4 1.23 111 Virgin de Plata 6.9 0.34 110 Virgin de Plata 10 0.62 142 El Arco
(9.7m with 3m missing in middle)
El Arco 10.5 0.50 105 Central 6 1.03 417 SE 62 0.03 6 North 1 0.53 349 Amarilla 1.5 0.54 494
Geological model and exploration targets
Radius's geological team believes there is potential for both high grade silver gold veins and bulk tonnage lower grade mineralization that could be amenable to open pit mining. Most of the known veins and associated stockworks have observed widths up to 25m and occur within a tightly spaced area approximately 1km x 600m defining an obvious open pit target. As the project has never been drill tested there is also potential to discover high grade vein systems and ore shoots at depth.
The next phase of work that will commence soon is an MT geophysical survey to help define deeper drill targets. Drill permitting is underway and Radius Gold hopes to have an initial drill program in the fall of 2021.
Radius can earn a 100% interest in the project by making staged payments to the private property owner totalling US$1,250,000 over three years with a final payment of US$1,060,000 due at the end of year three. A total of US$30,000 has been paid to date. The owner retains a 1% NSR which Radius can buy back for US$1,000,000. The property agreement covers several mineral concessions (total 155ha).
Quality assurance and quality control
Reported assays are rock chip and channels samples taken by Radius geologists and trained sampling teams. Sample intervals are generally 3m chip channels producing samples of between 2 to 9 kg. Reported samples were delivered to ALS in Chihuahua. The samples were crushed and pulverised and two 100 gram splits were taken. Radius geologists transported a 100g split to SGN labortory in Parral for rapid initial Ag and Au analysis. The second split was analysed by ALS Geochemistry for Au and Ag and multi-elements using method code ME-ICP61 following a four-acid digestion. Overlimits are analysed using an appropriate method. In effect duplicate analysis was done on all samples, ALS geochemistry an internationally certified labortory, and by SGN Labortories in Parral, a reliable mining labortory that is not internationally certified. This was completed to prevent delays which have become common during the COVID pandemic. Radius routinely inserts multi-element geochemical standards and blanks into the sample stream to monitor both laboratories performance. Quality control samples submitted were returned within acceptable limits. Comparisons between sample splits demonstrate acceptable accuracy and precision.