Drilling To Resume At The DeLamar Project In Idaho

VANCOUVER - Integra Resources Corp. reported the resumption of drilling at the DeLamar Project, situated in Owyhee County in southwest Idaho. "With enhanced operational procedures in place designed to protect the health of our staff and contractors, Integra is pleased to announce the resumption of drilling and other exploration activities at DeLamar," said George Salamis, President and CEO. "To mitigate the 4-week drill break implemented in response to the COVID-19 pandemic, Integra has prepared an accelerated drilling ramp-up period in May that will place heavy focus on the high-grade gold-silver targets at Florida Mountain. The significant driver of historic production that began in the late 1800's at Florida Mountain was the Trade Dollar – Black Jack vein system, a 2,000 m long structure that ran the width of the mountain. Roughly 200,000 oz Au was mined underground in rudimentary open stopes. Integra's drilling to date suggests that the historic mining targeted the visual vein system and there may exist, amongst other veins, a 3 m vein margin grading approximately 7 g/t Au to 10 g/t Au that was not mined due to the lack of visual confirmation. This winter's compilation work on historic Trade Dollar – Black Jack underground stope layouts indicates greater continuity of grade in the basement granites than within the overlying volcanics, where many of Integra's 2019 drill assays were concentrated. Our targeting for the current program will focus on the projected extensions of high-grade gold-silver shoots into these basement granites, and we look forward to the results from these exciting targets that are well below the current resource boundary. With a 2nd drill rig scheduled to arrive at Florida Mountain in June, we will be aggressively testing these high-grade targets this summer in an effort to add to the existing resource over the course of 2020."

Following a 4-week drill program break implemented in response to the COVID-19 pandemic, the recommencement of diamond drilling operations is scheduled to begin on or before May 20th. The Company plans to drill between 5,000 and 7,000 m in approximately 20 holes at Florida Mountain. A first diamond drill rig will conduct high-grade exploration into the vein system below Florida Mountain. While the majority of recent drill data gathered to date at Florida Mountain is within the shallow volcanics, compilation work conducted over the course of the winter on historic Trade Dollar – Black Jack underground stope measurements indicates greater continuity of gold and silver grade in the basement granite than within the overlying volcanics. Stratigraphically, from top to bottom at Florida Mountain, low-grade disseminated open-pit-able resources occur almost entirely in overlying felsic volcanics. In contrast, historic high-grade underground stopes are located mainly within the underlying granite, which is the more favorable high-grade host rock. To date, only very limited drilling for high-grade mineralized shoots has been conducted within the underlying granites, which will now form the basis for many of the high-grade targets to be tested in the program commencing momentarily.

In mid-June, the Company anticipates adding a second diamond drill rig to the Florida Mountain campaign. This second drill rig will be tasked with drill-testing the recently identified high-intensity 6 km2 soil geochemical anomaly that surrounds Florida Mountain. This drilling is designed to focus on low-grade, bulk tonnage oxide/transitional resource expansion, north and south of the deposit limits. Integra's drill crews are planned to then transition to testing the high intensity soil geochemical anomaly, immediately east of the deposit.

Upcoming drilling on the eastern anomaly at Florida Mountain has been designed to also test the potential for additional high-grade veins at depth. Integra's exploration team identified four additional roughly parallel vein structures that are similar in size and orientation to the historically productive high-grade Trade Dollar – Black Jack vein system. These 4 additional vein structures are located below the eastern anomaly at Florida Mountain, east of the historic Trade Dollar – Black Jack vein system, and are planned to be drilled in conjunction with the this anomaly. The aggregate strike length of these recently interpreted veins is over 5,000 m and represents several significant high-grade targets.

Induced Polarization (IP) geophysics work is scheduled to commence in the Black Sheep area northwest of the DeLamar Deposit in May, during which time Integra's exploration team will advance the mapping of targets at Black Sheep before the drill testing that is currently planned for late summer/fall. The IP geophysics crews are scheduled to then mobilize to War Eagle Mountain, to further refine and define high-grade gold-silver targets, before drilling is slated to begin at War Eagle in July. The IP geophysical field crews are scheduled to move to Florida Mountain in August to conduct surveys designed to highlight possible expansions to the Florida Mountain sulphides, situated below the current oxide and transitional resource. As depicted in the current NI 43-101 PEA released in Sept 2019, while most of the contemplated production plan calls for heap leaching of oxide and transitional resources at Florida Mountain and DeLamar, the potential development plan also includes the construction of a 2,000 tpd mill that will be designed to treat Florida Mountain sulphide mineralization. Test work conducted on Florida Mountain sulphide mineralization in 2019 demonstrates that a recovery of over 90% gold and 80% silver is to be expected from the milling and leaching of sulphide material from the Deposit.