The company announced that the lower zone of the prospect in Bulago exploration licence 1595 had returned very significant results in nine continuous jackhammer trenches and four outcrop exposures.
Lower zone assay results included peaks of 0.4m grading 293.5 grams per tonne gold and 0.3m grading 197gpt gold, plus 11 samples with more than 25gpt gold and 13 additional assays of at least 1gpt gold.
Very high grade gold results from the upper zone of Swit Kia were reported to the Australian Securities Exchange last month with 13 samples reporting more than 100gpt gold.
Frontier said the lower zone was not sampled as systematically as the upper zone due to the original exploration program planning and subsequent time constraints in the field.
The maximum strike length of both the upper and lower gold zones will be better defined with additional trenching and drill testing will be undertaken at the site.
"The exploration program conducted at the lower zone of the Swit Kia prospect, like the upper zone, was an outstanding success," Frontier chairman and managing director Peter McNeil said.
"There were nine excellent trench assay intercepts, plus four additional outcrop samples from a very high grade, sub-horizontal, gold mineralised horizon apparently localised at the juncture of an E-W trending dip slope fault.
"The very strongly sulphide mineralised, brecciated and silicified horizon was tracked laterally, cleaned, jack-hammered into channels, sampled, mapped and evaluated, as possible.
"The lower zone's East Creek strike extension returned 3m grading 45.17gpt gold and there were also results such as 0.4m grading 293.5gpt gold about 80m west, plus 2m of 37gpt gold a further 40m west, 2m of 41.5gpt gold a further 15m west and other very good gold results.
"The strike length of the lower zone will be properly defined with additional trenching in several maximum strike extension areas, plus infill trenching in known areas to better demonstrate the continuity and grade of the high-grade gold mineralisation.
"This work will further demonstrate the excellent overall prospectivity and ultimate resource potential of the lower zone."
McNeil said drill testing was strongly warranted at the Swit Kia prospect in both the upper and lower zones.
"Frontier will attempt to determine the dimensions of the high grade gold mineralisation as soon as possible and will accomplish this with one of the company's diamond core drilling rigs that will be shipped from Kimbe to Lae and on to Bulago," he said.