To better characterize and increase the size of the existing resource at AntaKori, culminating in an updated NI 43-101 resource estimate in first quarter 2019
April 2017 - October 2018
27 holes drilled by Regulus, 2 re-drilled holes, and 4 holes partially drilled by Coimolache onto Regulus ground
Total Meters Drilled
20,332.35 m (Table 1)
Total Holes Drilled
33 diamond drill holes averaging 700-800m in depth
Summary of Drill Results
View summary of mineralized drill results for Phase 1 in Table 2
The Phase 1 program commenced on the southernmost margin of the Regulus concessions and then moved to the north onto Regulus mineral concessions (Figure 1). The Phase 1 drill program was carried out by conventional wireline diamond drilling using up to 3 truck-mounted rigs. The core sizes used were mostly PQ (core diameter 85.0 mm) and HQ (63.5 mm), with NQ (47.6 mm) in deeper holes.
A summary of drill collar information for the Phase 1 diamond drill program carried out by Regulus in 2017-18 is in Table 1.
The program consisted of 27 diamond drill holes (AK-17-001 to AK-18-027), including two holes that were lost and re-drilled, for a total of 20,332.35 m. The hole lengths varied from 433.75 m to 1,421.40 m, with an average length of 801.76 m (excluding the two lost holes; 3A and 12A). Table 1 also includes parts of 4 holes totalling 1,031.15 m drilled by CMC on Regulus concessions.
The first five holes of the program were drilled from the southern margin of the Regulus concessions, along a lateral distance of approximately 900 m and all holes encountering significant mineralization outside of the currently reported 43-101 resource; which was encouraging in terms of potentially adding additional tonnage to the Antakori mineralized system. Drill holes at Antakori typically encountered the overlying Miocene volcanic rocks and high-sulphidation style mineralization prior to entering the Cretaceous sedimentary sequence and skarn style mineralization at depth. As drilling has progressed to the north, the volcanic rocks have terminated, and drill holes have entered directly into the skarn/porphyry environment within the Cretaceous sedimentary sequence (Figures 2 to 6 below).
A summary of mineralized drill intercepts reported from Regulus’ 2017-2018 Phase 1 drill program is in Table 2.
News releases related to AntaKori Phase 1 Drill Program:
To better characterize and increase the size of the 2019 Regulus Interim Mineral Resource Estimate at AntaKori, culminating in an updated NI 43-101 resource estimate in early 2020
October 2018 through 2019
Program Total Meters
Summary of Drill Results
See first 3 drill holes in April 2, 2019 news release here
The Phase 2 drill program commenced in late 2018, immediately following completion of Phase 1.
Phase 2 is anticipated to consist of approximately 25,000 metres of additional drilling with one rig currently drilling and a second rig ready to start drilling soon (Figure 1). When the rainy season stops in May, the rig count will be incrementally increased to 4 to 5 drill rigs to allow the completion of the planned drilling by the end of 2019. The Phase 2 program will initially focus on immediate extensions to the current resource including drill holes in the vicinity of AK-18-26 and will include drilling to offset the mineralization reported in AK-18-030. Approval of an additional drilling permit that will allow drilling further to the north and northwest to test geophysical targets that may represent additional skarn and/or porphyry style mineralization is anticipated by Q3-2019.
The preparation of a additional updated mineral resource estimate is anticipated for early 2020.
The first three holes of Phase 2 were completed in late 2018 after the cut-off date for inclusion in an updated mineral resource estimate (see news release of March 1, 2019). These three holes, AK-18-028, AK-18-029 and AK-18-030, were reported April 2, 2019.
See related news release below:
A table summarising all drilling known to have been carried out at the Antakori (formerly Sinchao) Project is shown in Table 3. A plan map showing all hole collar locations is given in Figure 1.
No. of Holes
Total Length (m)
Used for the 2012 Resource
Used for the 2019 Resource
Northern Peru Mining & Smelting Corp. (1)
Cerro de Pasco Corporation (2)
Kennecott Corporation (3)
El Misti Gold Ltd
El Misti Gold Ltd
El Misti Gold Ltd
Sinchao Metals Corp.
Regulus Resources Inc. (Phase 1)
Cia Minera Coimolache SA (4)
Table 3. Summary of all drilling carried out at the Antakori Project.
Abbreviations: DDH = diamond drill hole. RCH = reverse circulation drill hole.
Notes: (1) number of holes (“a number of holes”), meterage and location not known; (3) meterage and location not known; (1, 3) no assays; (2) Cu assays only; (1-3) no drill core; (1-3) not in database; (4) Parts of CMC holes that cut Regulus concessions.
Historical diamond drilling was carried out pre-1997 by Northern Peru Mining & Smelting Corporation (1923), Cerro de Pasco Corporation (1964), and Kennecott Corporation (1970). No accurate drill hole locations, azimuths or plunges for these holes have been located. In addition, no assays with certificates, drill core or other information from these holes has been found and hence they are not included in the Regulus database, nor were they used in either the 2012 Southern Legacy Minerals resource or the pending 2019 Regulus Resources resource calculations.
A summary of drill hole collar information for more recent historical diamond drilling programs carried out at Antakori (Sinchao) by El Misti Gold in 1997-98 and Sinchao Metals Corp. in 2007-08 is given in Table 4 (click here to view). Similar collar information for the historical reverse circulation drilling programs carried out by El Misti Gold in 1997-98 are listed in Table 5 (click here to view).
The 1997-98 drill program was carried out by reverse circulation drilling and conventional wireline diamond drilling. The 2007-08 drill program was carried out by conventional wireline diamond drilling. The drill core diameters used for the 1998 diamond drill programme were HQ (core diameter 63.5 mm) and NQ (47.6 mm). The HQ3 (61.1 mm) split‐tube sampling system was used for 6 holes (SDH‐001, 005, 007, 008, 009 and 010). The core diameters used for the 2007-08 diamond drill programme were PQ (core diameter 85.0 mm), HQ (63.5 mm) and NQ (47.6 mm).
To see the full exploration history, visit our Antakori Exploration History page.