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Alto Metals Re-invigorating Sandstone Gold Potential

THE INSIDE STORY: Alto Metals is aiming to re-establish standalone oxide and primary gold mining and milling operations at the company’s Sandstone gold project in Western Australia.

Alto Metals holds 800 square kilometres of the prospective Archaean Sandstone Goldfield in the East Murchison Mineral Field of WA.

Alto acquired the project in June 2016 and has compiled and reviewed a large legacy database leading to a series of focused exploration and drilling campaigns.

“We acquired the project in June 2016 andthe tenements were granted in September that year,” Alto Metals managing director Dermot Ryan explained to The Resources Roadhouse.

“During that 18 months we completed a detailed airborne magnetic survey, compiled a data base and made some new discoveries.

“Most of the Sandstone belt is covered by a layer of soil and sand and laterite, so airborne magnetics are needed to look to the basement rocks underneath to find favourable lithologies and structures for gold mineralisation.

“We did that, then burrowed through the Western Australia Mines Department historical soil sample and historical drilling results.

“We integrated those data sets and identified 56 targets we divided into camp-style areas, ranking them in order of potential prospectivity.”

Armed with this information, Alto aims to delineate a combined one million-ounce JORC 2012-compliant Mineral Resource, to be the basis for recommencing operations.

Work date has demonstrated this resource is likely to comprise relatively shallow gold deposits from brand new discoveries – new discoveries near known small deposits in the vicinity of Vanguard and Indomitable and expanding existing deposits such as Lord Nelson and Lord Henry.

“Oxidisation in the Sandstone region is around 50 metres deep, so drilling an angled hole to average of 41 metres depth, like many previous explorers at Sandstone, doesn’t test the primary zone,” Ryan explained.

“At targets such as Vanguard and Indomitable, we are drilling deeper, inexpensive aircore holes to get a good look in that primary zone with the view of developing these targets into open pit Resources we can mine from surface.

“For a junior company, discovering and mining a new deposit that is oxide on top and primary zone within 100 metres of surface is a better first option than drilling 200 to 300 metre holes under somebody else’s old pit.

“This deeper drilling can be funded later, or done now by others, if they have the requirement and the necessary funds.”

From a one-million-ounce start, Alto’s hopes to define over five million ounces of gold, which it considers comparable to other more intensely explored greenstone belts in the Yilgarn area.

Early results from RC and AC drilling conducted at the Vanguard and Indomitable targets demonstrated the Vanguard system contains many high-grade mineralised structures.

Alto’s drilling at Vanguard discovered four new high-grade mineralised structures, in addition to the previously known structure, providing further evidence the Vanguard system is robust and open.

Assay highlights from Alto’s RC drilling of the oxide zone at Vanguard included:

SRC046
8 metres at 7.8 grams per tonne from 34m;

SRC064
29m at 2.3g/t gold from 28m; and

SRC067
33m at 2.3g/t gold from 39m.

RC drill results from the primary zone at Vanguard included:

SRC075
22m at 4.2g/t gold from 88m, including 3m at 13.3g/t from 28m;

SRC016
17m at 4.5g/t gold from 122m, including 2m at 12.2g/t gold from 133m;

SRC032
22m at 3.3g/t gold from 103m, including 1m at 15g/t gold from 109m; and

SRC048
7m at 7g/t gold from 126m, including 2m at 10.8g/t gold from 128m.

“Between May and June 2018 we drilled over 12,000 metres of aircore over ten high priority prospect areas at Sandstone,” Ryan said.

“Approximately half of these holes, and half of the metres, were drilled around Vanguard and between Vanguard and Vanguard North.”

All five mineralised structures at Vanguard plunge shallowly to the northeast and remain open at depth.

The oxidation base was encountered at approximately 50m depth with mafic volcanics being the primary host rock.

A soil sampling program early this year identified a two square kilometre gold in soil anomaly connecting Vanguard and Vanguard North.

Assays of 197 of almost 400 samples from the Hancocks Mining Centre south of the Bull Oak pits defined a coherent 30 parts per billion (ppb) gold-in-soil anomaly over 9sqkm.

Assays from 28 samples out of a total of 340 samples collected near the Edale Fault returned anomalous results of over 7ppb gold in two discrete linear zones, each between 1,000m to1,500m long.

A third target, Chance, also lies on a splay of the Edale Fault.

“Our sampling program appears extensive, but we’re not blanket covering the whole belt,” Ryan said.

“We have focused on target areas of historic work that is incomplete.

“Once there, we are conducting detailed soil sampling to see if we can expand or constrain those targets for follow-up drilling.

“Although we have already completed 12,000 metres of aircore drilling this year, we have another 8,000 metres scheduled.”

More recent soil sampling over a geophysical target approximately 12km south of Sandstone has defined a plus 7ppb gold anomaly striking southeast over 1,500m.

In keeping with the history of naming prospects at Sandstone after WW1 British battleships, the target was dubbed ‘the Superb Anomaly’, possibly due to it returning a maximum value of 228ppb gold, with a further 13 samples returning over 15ppb gold.

The area hosting the Superb Anomaly was initially identified by Barry Bourne, a consultant of Terra Resources, in 2017 after processing and interpreting the detailed aeromagnetic data mentioned above that had been flown and/or compiled by Alto over the entire Sandstone project area.

Bourne described the target as, “a break in sediment/mafic stratigraphy with proximal mineralisation”.

“The Superb Anomaly lies in an area of iron rich duricrust, or laterite, so we need to determine whether the gold is representative of a primary gold source at depth, or is alluvial in nature,” Ryan explained.

“Further soil sampling will determine the extent of this gold in soil anomaly which is open to the south east.

“We have lodged a Program of Work for Aircore drilling with the Department of Mines, Industry and Safety and are awaiting approvals to enable us to start drilling.”

At the same time as the search proceeds for the new one million ounce discovery, Alto is reviewing potential for generating early cashflow from treating 100 year old battery sands from Hacks, Oroya, Havilah and Maninga Marley prospects.

Auger sampling and metallurgical test work is underway to determine the material’s viability for being incorporated into a low-cost heap leaching operation.

“There is still a lot of gold – underground – at Oroya, and we’re currently digitising the old level plans and having a look at what might be a residual Resource that we could do something with – or somebody else might want to do something with,” Ryan said.

“Hacks is another deposit mined by the old timers to the south of Sandstone that historically produced around 206,000 ounces of gold at 28 grams per tonne gold.

“In the short term we are reviewing all the existing open pits and looking at what potential may lie beneath them.

“The deposits we are looking at all have very high-grade in the primary zone.”

 

Alto Metals Ltd (ASX: AME)
…The Short Story

HEAD OFFICE
Suite 9
12 – 14 Thelma Street
West Perth, WA, 6005

Ph: +61 8 9381 2808

Email: admin@altometals.com.au
Web: www.altometals.com.au

DIRECTORS
Terry Streeter, Dermot Ryan, Dr Jingbin Wang, Terry Wheeler

 

Alto Metals Widens Hancock Anomaly

THE DRILL SERGEANT: Alto Metals (ASX: AME) has widened a gold-in-soil anomaly at the Hancocks prospect, part of the company’s Sandstone gold project in the East Murchison Mineral Field of Western Australia.

Alto Metals has received assay results for an additional 271 soil samples from the Hancocks prospect, taking the total to 478 samples collected in April 2018, which have defined a highly anomalous and coherent +15 parts per billion (ppb) gold-in-soil anomaly over eight square kilometres.

The company indicated that 93 of these samples (19% of total collected) assayed greater than 30ppb.

“Results from the first of three batches of soil samples collected at Hancocks, south of the Bull Oak open pits were reported on 13 June 2018,” Alto Metals explained it its ASX announcement.

“The results from the remaining two batches have now been received and integrated with the first batch to show the totality of the Hancocks eight square kilometre gold-in-soil anomaly.

“The regolith in this area is shallow, and there are numerous shafts and pits present (developed in the period 1894-1920) where the dumps surrounding the shafts contain fresh differentiated dolerite, banded iron formation (Bif), sediments and quartz.”

 

Email: admin@altometals.com.au

Website: www.altometals.com.au

 

Alto Metals Identifies New ‘Valiant’ Gold Anomaly

THE DRILL SERGEANT: Alto Metals (ASX: AME) received assay results for 336 soil samples collected near four litho-structural targets close to the town of Sandstone in Western Australia.

Alto Metals claims the assays have defined a coherent 15 parts per billion (ppb) gold-in-soil anomaly over 2.5 square kilometres.

The Valiant anomaly lies approximately seven kilometres south-south east of the town of Sandstone in an area that was initially identified as a prime site for gold mineralization by Terra Resources consultant Barry Bourne in 2017.

Four litho-structural targets, No’s. TR09 -TR11 and TR13 were identified when Bourne processed and interpreted the detailed aeromagnetic data flown and/or compiled by Alto over the entire Sandstone project area.

According to Alto, Bourne described the target as, “a break in sediment/mafic stratigraphy with interpreted felsic intrusives”.

“The systematic approach being applied at Sandstone, that is, detailed magnetic surveys to ‘look through’ lateritic cover, interpretation to identify favourable fractured iron rich host rocks, and follow up soil sampling, is potentially outlining new large gold systems,” Alto Metals managing director Dermot Ryan said in the company’s announcement to the Australian Securities Exchange.

“Drill testing of this latest soil anomaly is awaiting approval from the Department of Mines, Industry Regulation and Safety.”

 

Email: admin@altometals.com.au

Website: www.altometals.com.au

 

Alto Metals Claims New Vanguard Gold Mineralisation

THE DRILL SERGEANT: Alto Metals (ASX: AME) claimed discovery of gold mineralised systems at the Vanguard deposit on the company’s Sandstone gold project in Western Australia.

Alto Metals received 50 gram metre fire assays of four metre composite aircore samples taken from 35 AC holes drilled on the periphery of the Vanguard deposit.

According to the company, ten of these ‘extension holes’ intersected shallow intersections of plus-0.5 grams per tonne gold.

Assay highlights include:

SAC206
20 metres at 1.4 grams per tonne gold from 40m; and

SAC214
12m at 2.5g/t gold from 0m and 9m at 4.0g/t gold from 60m.

Alto interpreted these new gold results as further evidence the Vanguard system is robust and open and justifies the current aircore drill program to test and expand the footprint of the Vanguard gold deposit.

“Between 26 May and 25 June 2018, Alto completed 253 infill and/or extensional aircore drill holes for a total of 12,175 metres over ten high priority prospect areas at Sandstone,” Alto Metals managing director Dermot Ryan said in the company’s announcement to the Australian Securities Exchange.

“Approximately half of these holes and half of the metres were drilled around Vanguard and between Vanguard and Vanguard North.

“This first batch of four-metre composite assays now received from 35 holes around Vanguard are highly encouraging, and they add two more mineralised structures to the three mineralised structures previously defined by Alto.

“We are looking forward to the assay results of the outstanding 118 Vanguard AC holes over the next four to five weeks, which will potentially define further mineralized structures.”

 

Email: admin@altometals.com.au

Website: www.altometals.com.au

 

Alto Metals Defines ‘Superb’ Anomaly at Sandstone

THE DRILL SERGEANT: Alto Metals (ASX: AME) announced that soil sampling has located a strong linear gold-in-soil anomaly approximately 12 kilometres south of the Sandstone township in Western Australia.

Alto Metals said assays from 24 samples out of a total of 74 samples collected in the vicinity of a geophysical target approximately 12km south of Sandstone have defined a 1,500 metres-long, south-east striking gold in soil anomaly of plus-7ppb gold.

The maximum value was 228ppb gold, and 13 samples returned over 15ppb gold.

Alto said the assayed gold in soil anomaly, now known as the Superb Anomaly, lies in an area of iron rich duricrust (or laterite).

“It is not known at this stage whether the gold in the soil is representative of a primary gold source at depth or is alluvial in nature (ie. transported),” Alto Metals said in its ASX announcement.

“Further soil sampling is required to determine the extent of the gold in soil anomaly which is open to the south east.”

The company has lodged a Program of Work (PoW) for Aircore drilling with the Department of Mines, Industry and Safety but approval is yet to be granted.

 

Email: admin@altometals.com.au

Website: www.altometals.com.au

 

Alto Metals Defines Sandstone In-Soil Gold Anomalies

THE DRILL SERGEANT: Alto Metals (ASX: AME) completed soil sampling it claims to have located three linear gold-in-soil anomalies along an interpreted ‘splay’ off the Edale Fault near Sandstone in Western Australia.

Alto Metals described the Edale Fault as a major deep crustal feature forming the eastern boundary of the Sandstone Greenstone belt, and a potential conduit for emplacement of gold-rich fluids.

The company has received assays from 28 samples out of a total of 340 samples collected in the vicinity of the Edale Fault that have returned anomalous results plus-7ppb gold in three discrete linear zones, each between 1,000 metres to 1,500m long.

“Throughout the Yilgarn Craton, the bounding faults to the Archaean greenstone belts and their environs play host to major orogenic gold deposits,” Alto Metals managing director Dermot Ryan said in the company’s announcement to the Australian Securities Exchange.

“We are very encouraged by these coherent, linear gold in soil anomalies, which we intend to drill test as soon as our Program of Work is approved by the Department of Mines, Industry Regulation and Safety.”

 

Email: admin@altometals.com.au

Website: www.altometals.com.au

 

Alto Reviewing Gold Mine Potential

THE BOURSE WHISPERER: Alto Metals (ASX: AME) is conducting a review to ascertain the potential of the historic Oroya Black Range mine, approximately 500 metres east of the Sandstone township in Western Australia.

Alto Metals has carried out drone imagery along with other activities that include the capture of drill hole data into a digital database.

The company currently has digitising of historic level plans in progress.

The historic underground Oroya Mine is reported to have produced a total of 420,000 tonnes at 16.48 grams per tonne gold for 220,000 ounces of gold.

Alto Metals believes the Sandstone Reef of the Oroya Mine could represent a potential high-grade target at vertical depths of 300 metres below surface.

The company has a goal at Sandstone for the delineation of a plus-1 million ounce JORC 2012 Mineral Resource it hopes could become the basis for a re-establishment of standalone oxide and primary gold mining and milling operations at the project.

Alto also announced it has received assays for 197 samples collected in April 2018 south of the Bull Oak pits, six kilometres south east of the township of Sandstone.

“Assays from these samples have defined a coherent 30 parts per billion (ppb) gold-in-soil anomaly over 1.3 square kilometres which requires follow up,” Alto Metals said in its ASX announcement.

“Gold analyses for the remaining 282 soil samples collected in the area, which flank the anomalous gold-in-soil anomaly, are expected within two weeks.”

 

Email: admin@altometals.com.au

Website: www.altometals.com.au

 

Alto Metals Identifies Additional Aircore Drilling Targets

THE DRILL SERGEANT: Alto Metals (ASX: AME) received the first batch of assays from a regional soil sample program on the company’s Sandstone project in Western Australia.

Alto Metals said the program had defined several new gold-in-soil anomalies between and around the Vanguard and Maninga Marley areas of the project.

The sampling demonstrated extensive gold in soil anomaly associated with Vanguard (and Vanguard North), and a new northeast trending anomaly halfway between Vanguard and Maninga Marley, and a strong and extensive gold in soil anomaly to the north and east of Maninga Marley, which complements a previous soil anomaly detected by Troy Resources.

The recent sampling program followed a compilation put together by Alto of a patchwork of soil sampling programs from various previous explorers.

The soil sampling program is to involve 3,000 samples over 17 target areas that Alto expects will, “fill in the gaps” in regard to its current knowledge base.

“To date, 1,654 soil samples have been collected and submitted for low level gold analysis, and results have been received from the first batch of 332 samples located between Vanguard and Maninga Marley,” Alto Metals said in its ASX announcement.

“The results of Alto’s two previous soil sampling programs, located over Vanguard and Maninga Marley indicated that gold in (residual) soils was more widespread than previously thought, and that further soil sampling at Sandstone could assist in the identification and ranking of gold targets for drill testing.

“The current soil sampling program is approximately 50 per cent complete, with another 1,400 samples planned to be taken.”

Alto Metals indicated a nominal 20,000 metre program of aircore drilling has been budgeted for drill testing soil anomalies at Vanguard, Maninga Marley, and a number of other prospects.

This work will commence in late May with RC drill testing to follow shortly thereafter.

This program includes a 5,000m aircore drilling program between and around Vanguard and Vanguard North, and these new soil results will add further holes and metres to that program.

 

Email: admin@altometals.com.au

Website: www.altometals.com.au

 

Alto Metals Improves Vanguard Gold Values

THE DRILL SERGEANT: Alto Metals (ASX: AME) released results from 50gm fire assays carried out on one-metre individual RC samples from a recent drilling program.

Alto Metals said the 15 hole and 1 re-entry drilling program had been undertaken in February at the Vanguard prospect within the company’s Sandstone gold project in the East Murchison Mineral Field of Western Australia.

Fire assays from one-metre samples from Vanguard primary zone include:

SRC075
25 metres at 3.8 grams per tonne gold from 85m, including 9m at 6.4g/t gold from 89m and 6m at 7g/t gold from 104m, including 4m at 10.7g/t gold from 106m; and

SRC060
10m at 3.7g/t gold from 81m.

On completion of the Vanguard drilling, Alto moved the RC rig to the Indomitable prospect to test a new model of mineralisation.

Fire assays from one-metre composite samples from the three holes completed before the weather moved in returned numerous 1m to 5m intervals of 0.5g/t gold to 1.95g/t gold.

The best result returned was:

SRC086
5m at 2.5g/t gold from 91m.

“As reported on 20 February 2018, the RC drilling completed in February has better defined the structures hosting gold mineralisation in fresh rock, and shown that the mineralisation remains open at depth,” Alto Metals said in its ASX announcement.

“As expected, 50gm fire assays of the one-metre samples produced higher-grade gold results over slightly shorter intervals than the assays from the four-metre composite samples.”

 

Email: admin@altometals.com.au

Website: www.altometals.com.au