As mentioned, copper oxide ores are not as attractive an exploration target as copper sulfide ores due to their lower grade.

Source: https://investingnews.com/jaxon-targets-antimony-copper-rich-porphyry-systems-at-blunt-kispiox-mountains-advances-modeling-to-support-future-drill-tests-of-copper-rich-polymetallic-porphyry-systems-at-netalzul-mountain-red-spr/

Continuation of advanced exploration in Portugal through the Alvalade Joint Venture with Sandfire MATSA, particularly within the Sesmarias massive sulfide deposit.

Source: https://investingnews.com/avrupa-minerals-to-continue-positive-progress-in-finland-portugal-and-kosovo-in-2023/

It is also not unusual to see a high-grade volcanic massive sulfide deposit support a strip ratio greater than 5:1.

Source: https://investingnews.com/hudbay-and-copper-mountain-announce-filing-of-joint-management-information-circular-in-connection-with-proposed-combination-and-support-from-largest-shareholders/

The East Zone conductor is the largest and highest amplitude in the entire survey, with near-surface conductors consistently correlated with intense copper sulfide mineralization at surface.

Source: https://theclarion.ca/media-release/vr-receives-noi-drill-permit-for-new-boston-and-prioritizes-drill-targets-for-the-copper-moly-silver-porphyry-system-in-western-nevada/

The lower section of the interval contains very strong mineralization with 1-5% visual sulfide and localized breccias containing up to 30% chalcocite.

Source: https://investingnews.com/aston-bay-and-american-west-metals-announce-major-copper-discovery-at-the-storm-copper-project-canada/

The new dangers found in the FAU study add to the risks already associated with sargassum, chiefly the risk to people with respiratory problems stemming from the release of hydrogen sulfide, which gives the sargassum it’s unpleasant odor.

Source: https://www.bostonherald.com/2023/05/30/florida-bound-giant-seaweed-blob-contains-flesh-eating-bacteria-study-shows/

Then low residual concentrations of hydrogen sulfide can cause irritation to the eyes, nose, and throat.

Source: https://caymannewsservice.com/2023/03/no-easy-fixes-for-giant-sargassum-blob/

The upper zone of copper mineralization encountered within ST23-03 is a 48.6m thick interval of strong breccia and vein-style copper sulfides grading 3% Cu, with broad zones of semi-massive to massive sulfide from 34.4m downhole.

Source: https://investingnews.com/lumina-gold-to-present-at-the-metals-and-mining-virtual-investor-conference-october-4th/

Workers exposed to methane, ethane, carbon dioxide, hydrogen sulfide or other hydrocarbon components from drilling and refining can experience respiratory problems, headaches, dizziness and insomnia.

Source: https://www.forbes.com/sites/forbestechcouncil/2023/11/28/technology-making-todays-liquefied-natural-gas-lng-industry-safer/