INCAHUASI and LAS BURRAS
(High temperature vein-porphyry: mesothermal au)
By
Dr. T.A. Richards and Ron Bilquist
January, 2003
Geology and Setting
The Las Burras-Incahuasi mineralized systems are hosted in Tertiary stocks, dykes and volcanics, intrusive into late Proterozoic sedimentary and Cambrian intrusive rocks.
The Las Burras-Incahuasi region contains three separate showings and numerous occurrences with quartz, sericite, tourmaline and pyrite alteration. Mineralization occurs as stockworks, veins, porphyry and greisen settings. Original work focused on three porphyry copper-gold prospects outlined by quartz veinlets and stockworks associated with phyllic and argillic alterations and supergene jarosite, goethite and live hematite leach-cap assemblages with accompanying copper chrysocolla and turquoise. The largest of these (Las Burras) is an 800 by 200 meter alteration and leach-cap zone. Zones of highly anomalous gold are peripheral to each of these porphyry settings and previous work down played their potential as a gold play. These are vein and stockwork systems of quartz, pyrite, sericite, specular hematite and tourmaline that appear to represent a stage of mineralization later than, and peripheral to, the porphyries. These include:
The cover photo is of the Las Burras prospect. The small ridge in the foreground hosts anomalous gold values.
Status
The ground was applied for in 2003, passed the period for contestation and has been subsequently granted. At both Incahuasi and Las Burras there is privately owned grazing or farmland. The owners of this land would have to be notified prior to exploration work being carried out.
2003 Analysis
AA | Mo ppm | Cu ppm | Pb ppm | Zn ppm | Ag ppm | Mn ppm | Fe % | As ppm | Sb ppm | Bi ppm | Au **ppb | Name |
---|---|---|---|---|---|---|---|---|---|---|---|---|
SR 6020 | 13 | 994 | 1373 | 54 | 4 | 76 | 35.2 | 941 | 7 | 70 | 1020 | Las Burras |
AL 0129 | 30 | 141 | 9228 | 68 | 84.1 | 122 | 10.68 | 606 | 162 | 98 | 1010 | Las Burras |
SR 6023 | 4 | 81 | 438 | 1038 | 1.8 | 438 | 30.39 | 271 | 3 | 27 | 990 | Las Burras |
BR 3121 | 58 | 1632 | >9999 | 1173 | 57.2 | 218 | 15.38 | 698 | 166 | 9 | 850 | Las Burras |
BR 3120 | 242 | 887 | 7715 | 2030 | 14.8 | 5280 | 9.57 | 507 | 26 | 37 | 410 | Las Burras |
SR 6024 | 20 | 142 | 46 | 44 | 1.1 | 72 | 8.01 | 107 | < 3 | 3 | 180 | Las Burras |
BR 3123 | 9 | 62 | 57 | 15 | 6 | 128 | 3.17 | 22 | < 3 | 17 | 130 | Las Burras |
SR 6025 | 34 | 282 | 1135 | 56 | 20.1 | 92 | 13.42 | 161 | < 3 | 51 | 130 | Las Burras |
SR 6022 | 6 | 158 | 15 | 22 | 2.4 | 67 | 8.51 | 69 | < 3 | 8 | 110 | Las Burras |
BR 3122 | 7 | 60 | 149 | 16 | 1.4 | 118 | 3.46 | 87 | < 3 | 5 | 70 | Las Burras |
AL 0127 | 15 | 290 | 8 | 16 | 0.7 | 42 | 4.82 | 68 | < 3 | 5 | 30 | Las Burras |
SR 6026 | 5 | 108 | 20 | 29 | 0.8 | 99 | 4.2 | 29 | < 3 | < 3 | 30 | Las Burras |
AL 0122 | 49 | 225 | 10 | 27 | < .3 | 69 | 1.38 | 7 | < 3 | < 3 | 10 | Las Burras |
AL 0123 | 8 | 167 | 21 | 14 | < .3 | 74 | 2.12 | 9 | < 3 | < 3 | 10 | Las Burras |
AL 0124 | 109 | 54 | 9 | 9 | 0.3 | 56 | 2.29 | 7 | < 3 | < 3 | 10 | Las Burras |
AL 0125 | 103 | 381 | 31 | 4 | 0.3 | 38 | 5.33 | 6 | 3 | < 3 | 10 | Las Burras |
AL 0126 | 36 | 21 | 14 | 4 | 0.5 | 42 | 1.35 | 6 | < 3 | < 3 | 10 | Las Burras |
AL 0128 | 283 | 27 | 10 | 9 | < .3 | 138 | 0.49 | 2 | < 3 | < 3 | 10 | Las Burras |
BR 3124 | 8 | 95 | 157 | 74 | 2.7 | 529 | 4.07 | 35 | < 3 | 7 | 10 | Las Burras |
SR 6021 | 29 | 31 | 132 | 259 | 1.7 | 487 | 6.07 | 31 | < 3 | 8 | 10 | Las Burras |
BR 3038 | 1 | 189 | 378 | 527 | 1.2 | 827 | 12.73 | 18 | 5 | 16 | 11175 | Incahuasi |
BR 3126 | 7 | 53 | 15 | 9 | 1 | 252 | 7.28 | 85 | < 3 | 66 | 10090 | Incahuasi |
BR 3017 | 6 | 103 | 13 | 5 | 0.8 | 189 | 8.17 | 71 | 3 | 204 | 6250 | Incahuasi |
AL 0023 | 3 | 27 | 3 | 15 | 2.5 | 95 | 7.69 | 88 | < 3 | 19 | 5925 | Incahuasi |
SR 6028 | 7 | 380 | 56 | 19 | 4.5 | 92 | 9.97 | 135 | < 3 | 108 | 5000 | Incahuasi |
AL 0136 | 17 | 363 | 67 | 15 | 4.4 | 147 | 7.83 | 124 | < 3 | 238 | 4360 | Incahuasi |
BR 3127 | 4 | 42 | 20 | 46 | < .3 | 205 | 12.4 | 54 | < 3 | 36 | 3330 | Incahuasi |
AL 0147 | 1 | 436 | 8 | 20 | 0.9 | 108 | 1.71 | 13 | < 3 | 3 | 3170 | Incahuasi |
SR 6040 | 4 | 241 | 70 | 69 | 3.4 | 122 | 13.91 | 83 | < 3 | 73 | 3010 | Incahuasi |
BR 3020 | 2 | 106 | 12 | 10 | 0.6 | 54 | 4.39 | 40 | < 3 | 9 | 2950 | Incahuasi |
BR 3033 | 4 | 168 | 10 | 40 | < .3 | 136 | 3.17 | 6 | < 3 | 3 | 2700 | Incahuasi |
AL 0146 | 3 | 885 | 49 | 30 | 0.3 | 40 | 6.26 | 143 | < 3 | 31 | 2660 | Incahuasi |
BR 3035 | 12 | 32 | 170 | 228 | 12.4 | 1070 | 18.55 | 93 | < 3 | 20 | 2550 | Incahuasi |
BR 3128 | 3 | 161 | 4 | 8 | 1 | 206 | 4.82 | 25 | < 3 | 77 | 2540 | Incahuasi |
BR 3041 | 8 | 28 | 107 | 125 | < .3 | 170 | 16.97 | 222 | 4 | 146 | 2485 | Incahuasi |
AL 0037 | < 1 | 34 | 360 | 1193 | 24.7 | 664 | 4.86 | 299 | 6 | 6 | 2270 | Incahuasi |
BR 3036 | 6 | 91 | 45 | 39 | < .3 | 138 | 12.47 | 71 | < 3 | 12 | 2243 | Incahuasi |
SR 6029 | 5 | 57 | 26 | 13 | 1.5 | 85 | 4.74 | 61 | < 3 | 23 | 1840 | Incahuasi |
AL 0024 | 4 | 30 | 8 | 21 | 1.3 | 105 | 9.89 | 52 | < 3 | 31 | 1775 | Incahuasi |
AL 0151 | 2 | 23 | 17 | 46 | 1.2 | 164 | 4.82 | 9 | < 3 | < 3 | 1550 | Incahuasi |
BR 3037 | 8 | 67 | 52 | 12 | < .3 | 54 | 8.2 | 11 | 3 | < 3 | 1488 | Incahuasi |
AL 0132 | 4 | 187 | 7 | 14 | < .3 | 267 | 3.51 | 27 | < 3 | 4 | 1220 | Incahuasi |
SR 6030 | 5 | 380 | 32 | 92 | 36.9 | 879 | 15.88 | 197 | < 3 | 806 | 1140 | Incahuasi |
BR 3140 | 8 | 72 | 29 | 57 | 0.5 | 246 | 21.39 | 160 | 5 | 13 | 1100 | Incahuasi |
SR 6027 | 1 | 394 | 13 | 11 | 0.3 | 119 | 3.31 | 49 | < 3 | 28 | 1000 | Incahuasi |