The Mineral Mountain property, consisting of 209 mineral lode claims (4,180 acres), is located in the Mineral Mountain District, Pinal County, approximately 15 miles east of Florence, Arizona.
The Mineral Mountain copper project is interpreted to cover the surface expression of a buried porphyry copper system based on published geology, alteration, veining, gold-silver mineralization and the data collected by Copper Fox. Interpretation of the data suggests that the gold-silver mineralization, alteration and veining is a lateral/vertical expression of a buried porphyry copper system.
The Mineral Mountain copper project was generated internally by Copper Fox based on the following; i) a former gold-silver mining district with numerous small underground mines, ii) numerous occurrences of copper mineralization in outcrop and iii) published geology for the area and iv) mineralized fissures, veins etc. are exposed over an area that measures approximately 3 kilometres by 3 kilometres.
The Globe-Miami, Resolution, Florence and Casa Grande copper districts are located in Central Arizona and occur along the northeast trending Jemez Trend structural zone. (see table below). The Mineral Mountain copper project is located on this trend between the Florence copper deposit and the Resolution copper deposit. Public information on the copper resources in each of the above listed districts is set out below:
contained copper (lb)
*In-Situ Leach ("ISL") project. Only oxide portion of the deposit.
The porphyry copper deposits in the Miami-Globe & Resolution deposits are reported to contain significant concentrations of molybdenum.
The Mineral Mountain project is located within the Laramide porphyry copper province in Arizona is one of the most prolific copper mineralized districts in the world. Arizona is mining friendly; politically secure with excellent and readily accessible infrastructure.
The Mineral Mountain area is underlain by Precambrian rocks that includes Pinal schist, diabase and granite that have been intruded by Laramide age quartz monzonite, granodiorite and hornblende dacite dikes. Laramide age intrusive rocks and their associated country rocks host the majority of porphyry copper deposits in Arizona.
The northern half of the property is underlain by Precambrian Pinal Schist and diabase with minor Miocene age intrusive rocks and quartz latite. The central portion of the property is host to an interpreted graben and based on mapped observations would be analogous to a trans-lithospheric shear zone as described by Richards, et, al 2003. The portion of the property located south of the interpreted graben is underlain by a suite of Laramide intrusive rock (Mineral Mountain Quartz Monzonite) that make up approximately 50% of the area. The balance of this portion of the property is underlain by Precambrian Pinal Schist, diabase and granite.
The structural model for the property is interpreted to be a northwest trending graben formed by regional scale shearing (Richards, et. al.). To the east the graben appear to coalesce into single structure. This structure extend beyond the western edge of the property. Laramide intrusive rocks and Precambrian Pinal Schist and diabase occur within the interpreted graben structure.
The post Laramide faulting on the north side of the graben bring, Laramide age granodiorite into contact with Precambrian Pinal Schist and diabase. On the south side of the graben, the faulting brings Pinal schist and diabase into contact with Laramide age quartz monzonite.
The interpreted graben structure is cut by a later series of generally north trending faults that cross cut Laramide age hornblende dacite dikes.
The majority of the structural features on the property are confined to a generally north-south trend that is approximately 3 kms wide. All mineralized fissures occur within this north-south trend.
The structural fabric of the property consists of a prominent set of west-northwest trending faults that crosses the center of the property. These faults appears to have been active over an extended period of time and exhibit both sinistral and dextral movement. Toward the western side of the property, this series of faults are more close spaced and create "structural boundins" oriented in a north-south direction.
On the east side of the property, the orientation of faults and mineralized fissures suggest the presence of a crude circular structure that measures approximately 2 kms in an east-west direction and 1.5 kms in a north-south direction.
A preliminary geochemical stream sediment sampling survey completed by Copper Fox returned trace to abundant copper oxide mineralization with a coincident suite of pathfinder minerals typical indicative of porphyry copper environment (epidote, rutile, tourmaline, and pyrite) over an area that measured approximately 7 kilometres by 15 kilometres.
Systematic outcrop sampling within the anomalous area outlined by the stream sediment sampling. A total of 171 outcrop samples each approximately one kilogram of selected rock chips was collected from mineralized outcropping material on a rough 400 meter by 400 meter grid to characterize the metals present in veins and other mineralized structures. Significant mine workings that did not fall near a grid sample site were also sampled.
The rock sampling delineated three separate, stacked copper-molybdenum-gold-silver-tungsten geochemical anomalies (Zones 1-3) within a maximum area of approximately 6 kilometres long and 3.0 kilometres wide. Metal values greater than copper 100 ppm, gold 10 ppb, silver 2 ppm, molybdenum 2ppm and tungsten 5ppm are considered anomalous. The range of values and Median Value for each element are set out below.
Note: All values expressed in parts per million ("ppm") except gold which is expressed in parts per billion ("ppb").
The mineralization in the Mineral Mountain mining district occurs in fissures that formed in a tensional tectonic regime. These fissures are postulated to be the pathway for ascending mineralized solutions that formed the mineralization within the district.
The first target area (approximately 3.0 kms by 1.5kms) is located in the northern portion of the property and is underlain by Precambrian Pinal schist with minor Miocene age quartz latite and intrusive rocks. The structural fabric in this target is oriented north-south and east-northeast. Both structural fabrics are mineralized with the north-south trend being the dominant set.
The mapping completed by Copper Fox shows good correlation between the copper mineralization in outcrop and sericite alteration. The sericite alteration is more pervasive than the copper mineralization.
The geochemistry shows a copper-molybdenum zone with significant gold-silver enrichment. The gold footprint is larger than that of copper-molybdenum and could be due to a Miocene mineralizing event.
The second target (approximately 2.0 kms by 1.5 kms) is located in the center of the property immediately south of the interpreted graben structure. The north side of the target and the northern extension of the Laramide intrusive rocks are defined by the interpreted graben.
The mapping completed by Copper Fox shows a dominant northeast trend to both the copper and sericite alteration mapped in outcrop. The zone of copper mineralization extends over a distance of approximately 2.0 kms by 0.8kms. The sericite alteration is located adjacent to but west of the copper mineralization in outcrop.
This zone is copper-molybdenum dominant with significant gold-silver values and is underlain primarily by Laramide age quartz monzonite and granodiorite. The gold-silver distribution is larger than the copper-molybdenum footprint.
The third zone (approximately 1.5 kms by 1.0 km) is located at the south end of the property and is predominantly underlain by Precambrian age two mica granite and diabase intrusive rocks. East-west trending, Tertiary age granodiorite porphyry dikes and intrusive bodies occur within the center of his target.
The mapping shows a similar relationship between the copper and sericite in alteration in outcrop with the sericite being located adjacent to but west of the copper in outcrop. The target is copper-molybdenum dominated with a broader molybdenum footprint compared to copper and gold. This area is similar to Target # 2 in that it is copper-molybdenum dominant with significant gold-silver values. This target area exhibits a prominent northeast trend associated with northeast trending faulting.
The crude alteration assemblages observed in outcrop suggests a porphyry environment.
In general, quartz and quartz-hematite veinlets occur throughout the property; in all three target areas and along on the peripheries of the project area.
Several of the sample points located approximately in the centre of the property exhibit magnetite, and biotite veining and potassic alteration envelopes suggesting the presence of potassic alteration. The widespread nature of the sampling prohibits defining a discrete zone of potassic alteration.
Sericite demonstrates a definable pattern in outcrop. Inside the zone of intense structural disruption, discrete zones of sericite alteration as envelopes along veins and fractures occur over areas ranging in size from 1.0 km to 3.0 km in length and from 0.5 kms to 1.0 kms in width. Quartz-hematite veinlets are ubiquitous with the sericite alteration.
Sericite alteration assemblages generally occur in the centre of the property. The sericite alteration shows a direct correlation with the copper mineralization in outcrop in Target #1. The interpreted sericite alteration zone in Target#1 is considerably larger that zone of copper mineralization. In Target #2, and Target #3 the size of the sericite alteration zone is approximately the same size but is located immediately west of the zone of copper mineralization in outcrop.
Occurrences of epidote-chlorite alteration (propylitic alteration) occurs along the fringes of the sericite alteration in Target #2 and Target # 3. Fluorite veining is most pronounced in Target #1.
During the mapping program, a considerable number of vein assemblages typical of a porphyry environment were observed in outcrop over the property. Vein assemblages include: sheeted biotite, epidote-quartz-hematite, quartz-hematite, quartz with sericite and albite selvages, chlorite, epidote-chlorite, quartz-magnetite, quartz-pyrite-jarosite, siderite-barite, fluorite-quartz with sericite selvages, quartz-tourmaline, hematite-quartz with potassic selvages and D veins were observed in bedrock.
A total of 21 occurrences of copper mineralization were located during the mapping program. The supergene copper mineral assemblage consists of malachite, chryscolla, chalcocite, melaconite and aurichalcite.
In Target #1, the copper mineralization is hosted in Pinal Schist and Miocene age quartz latite. In Target #2, the copper mineralization is hosted in Laramide quartz monzonite. In Target #3, the copper mineralization is hosted in Laramide age intrusive dikes and Precambrian Ruin granite and Diabase. The copper mineralization occurs primarily in quartz veinlets (four veins orientations) hosted in the Precambrian rocks and Laramide intrusive rocks.