Royal Road Minerals | Los Andes
18770
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Los Andes

Los Andes Project

 

The Los Andes district is located 90 km from Managua in the Department of Boaco.  Access is via a major paved highway from Managua. Caza controls 100% of six mineral exploration concessions covering the Los Andes District. The total concession package is approximately 18,500 hectares.

Within the district dominant rocks are andesitic volcanics belonging to the Late Oligocene to Early Pliocene Coyol Group.  Numerous intrusive rocks cut the volcanic sequence, with at least one large dioritic porphyry identified at Los Andes. Hydrothermal alteration is extensive throughout the licence areas and is typically a combination of argillic (silica-clay), advanced argillic (silica-alunite), and silicification. Cerro Quizaltepe is a prominent hill thought to represent the upper level of a buried porphyry.

Figure 1 Nicaragua simplified geology and location of Royal Road Minerals Ltd licences held through NICAZA SA

Around the lower slopes of Cerro Quizaltepe over 1,500 rock chip samples were collected with 123 returning values greater than 200ppm copper and 31 greater than 500ppm. A similar halo of elevated gold was also recorded.

An airborne geophysical survey over the Los Andes area highlighted a well-defined magnetic anomaly corresponding to the area of most intense hydrothermal alteration. 3D modelling of this data implies a magnetic body, possibly related to a potassic core at a depth of approximately 500 meters below the porphyry outcrop mapped at surface.

Royal Road is currently conducting geophysical measurements (magnetic susceptibility) on drill core from QZP-003 with the aim being to better constrain the 3D model and provide a robust porphyry drill-target.

Figure 2a Los Andes RTP magnetic image with copper rock chips

Figure 2b Los Andes ternary radiometric image with gold rock chip results and RTP magnetic high window 

Short exploratory drilling campaigns conducted in 2014-15 targeted silicified lithocaps and localized breccias at Pedregal in the north while 3 holes were drilled into Cerro Quizaltepe. Strong alteration and anomalous copper, silver, and gold was intersected in a number of holes but potentially economic intervals of mineralisation were not identified.

QZP-003 was the only hole collared into the porphyry body with the last 130 meters intersecting intensely altered and pyritic breccia anomalous in copper and which is interpreted as a “pyrite-shell”, related to potential underlying porphyry-style copper (± gold) mineralisation.

Figure 3. Drillhole QZP003 example of intensely altered pyritic breccia, typical of last 130m of the hole.

TerraSpec alteration mapping confirmed the extent of the significant lithocap outcrops while also highlighting the increasing alteration intensity from argillic ® advanced argillic ® strongly advanced argillic with increasing proximity to Cerro Quizaltepe, the only mapped porphyry in the district.