Talk:Gold

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Current status: Former featured article candidate

Environmental Impacts[edit]

The four main types of gold mining include placer mining, hard-rock mining, byproduct mining, and gold ore processing that can all negatively impact the environment by changing the hydrology of streams, destroying land, and polluting soil and water with toxic chemicals such as mercury and cyanide. [1] [2] [3] [4] [5] [6]

References

  1. ^ "Mining : What Is Gold Mining? How Is Gold Mined?". Geology Page. 16 April 2019.
  2. ^ Madison, Robert. "EFFECTS OF PLACER MINING ON HYDROLOGIC SYSTEMS IN ALASKA" (PDF). blm.gov. U.S.DEPARTMENT OF THE INTERIOR Bureau of Land Management Alaska. Retrieved 05/17/2021. {{cite web}}: Check date values in: |access-date= (help)
  3. ^ "Hard-Rock Mining Contamination". toxics.usgs.gov. Retrieved 17 May 2021.
  4. ^ "Office of Wastewater Management - Hardrock Mining: Environmental Impacts". www3.epa.gov.
  5. ^ "Hardrock Mining". National Wildlife Federation. Retrieved 17 May 2021.
  6. ^ "How can metal mining impact the environment?". American Geosciences Institute. 13 November 2014. Retrieved 17 May 2021.

Gold marker mini rods in cancer radiation therapy[edit]

Very small gold rods (1mm x 5mm) are often used as position markers in stereotaxic radiation therapy / surgery, e.g. with the TrueBeam and Cyberknife systems. Several of these markers are implanted very near (but not inside of) the targeted tumor during minimal-invasive minor surgery. Since gold is impermeable to X-rays, the rods' strong shadow helps the CT-based control system automatically detect and exactly measure breathing-related movements of the patient's torso, up to 8-12 times per second.

During breathing in/out, the LINAC delivering therapeutical electron-beam or gamma-photon dosage can be gated (blocked) for gantry-based devices or modulated (continously adjusted in position) for the KuKA robotic arm mounted Cyberknife system. The gold markers are usually removed after treatment - that's why they cannot be placed inside of the tumor proper, since their retraction could result in removal and dispersion of some cancer cells within the body. 94.21.160.79 (talk) 17:36, 30 June 2023 (UTC)[reply]

I'm not immediately sure where this would fit but it would need a high-quality source to support it before we could use it, as it is medical information. See Wikipedia:Identifying reliable sources (medicine)/FAQ. Don't worry about pretty formatting, anybody can do that: the hard part is finding the reliable evidence. --𝕁𝕄𝔽 (talk) 18:24, 30 June 2023 (UTC)[reply]
Fiducial markers are used in positioning and imaging across a range of medical contexts, and come in a variety of shapes and materials depending on the particular application. Some are small rods, some are rods or beads connected by a linker, some are coils, some are tiny beads implanted in bone. Some are left in place permanently and some are intended to be removed. Many are gold or gold-alloy based, but there are also polymer and carbon markers. In some cases, gold's strong x-ray shadow is a drawback rather than a benefit--while it provides high contrast in portal imaging systems, it can also introduce artifacts in CT scans and distortions in MR imaging.
(Incidentally, fiducial marker is an article that could use some well-sourced love and attention.) TenOfAllTrades(talk) 10:29, 1 July 2023 (UTC)[reply]

Gold reactivity[edit]

Gold not reacting with KOH/NaOH in solution or molten state can be debated, typical etching with KOH will take time, visible in nano scales.

Semi-protected edit request on 20 September 2023[edit]

It is wrong I will Chang every IT to wright way 188.141.118.225 (talk) 18:19, 20 September 2023 (UTC)[reply]

 Not done: it's not clear what changes you want to be made. Please mention the specific changes in a "change X to Y" format and provide a reliable source if appropriate. RudolfRed (talk) 18:41, 20 September 2023 (UTC)[reply]

Semi-protected edit request on 22 September 2023[edit]

Change from parentheses (") to {{gloss}}, to clarify the "Etymology" section. 112.205.179.117 (talk) 12:22, 22 September 2023 (UTC)[reply]

 Done Paper9oll (🔔📝) 12:29, 22 September 2023 (UTC)[reply]

Semi-protected edit request on 20 October 2023[edit]

I would like to add the following information to the "Pollution" section, which is listed under the "Environmental Impact" in other metals page (eg https://en.wikipedia.org/wiki/Copper#Environmental_impacts):

The estimated impact of gold mining on global warming was 12.5 tCO2eq per kg of gold in 2019[1]. By 2020, the BBC reported an increase to 16 tCO2eq per kg of gold[2]. Research111 (talk) 10:19, 20 October 2023 (UTC)[reply]

 Not done: it's not clear what changes you want to be made. Please mention the specific changes in a "change X to Y" format and provide a reliable source if appropriate. Awhellnawr123214 (talk) 06:30, 1 November 2023 (UTC)[reply]

science[edit]

what gold uses for? 136.158.24.108 (talk) 13:06, 13 November 2023 (UTC)[reply]

See Gold#Other applications. --𝕁𝕄𝔽 (talk) 16:08, 13 November 2023 (UTC)[reply]

Naming[edit]

It's incorrect. The word "gold" does not come from "aurum". It is Germanic. Grassynoel (talk) 21:54, 24 January 2024 (UTC)[reply]

Semi-protected edit request on 22 March 2024[edit]

Typo fix required:

This article is protected, so I can't fix it, so someone else will have to (I suppose if you like you could delete this note afterward, I don't know if that is customary). Anyway, in the section Chemistry/Rare oxidation states, the last sentence of the fourth paragraph: "It has been shown to unexpectedly stable at normal conditions" obviously should read "to be". I hate it when I find this sort of stuff in wiki articles, and fix them when I can. 2001:56A:F0E9:9B00:68D5:5DEB:2E68:F861 (talk) 01:04, 23 March 2024 (UTC)JustSomeWikiReader[reply]

 Fixed Thanks for noticing, and fixing or reporting these sorts of things as you are able! DMacks (talk) 03:59, 23 March 2024 (UTC)[reply]

Chemical reactivity in gaseous compounds[edit]

Although solid metallic Au is very unreactive, the opposite is true of gaseous gold. It very readily forms compounds with well over half the periodic table.

Some 40 years ago my DPhil research concerned the spectroscopy of the diatomic molecules CeO and Cu2. I learned then that more AuX compounds had been characterized with an element X other than, perhaps, oxygen which forms XO molecules. Hydrogen, forming HX, came a distant third.

If a sub-topic about this is decided to be worthwhile, I will try to dig up appropriate references and write the text. Xilman (talk) 16:39, 24 March 2024 (UTC)[reply]

Hi User:Xilman. I think content about that sort of topic would definitely be worth having. It's on-topic and seemingly not mentioned in the article we have now. And it's such a contrast to its behavior in the solid state (and the "common knowlege" based on it). I haven't looked at gold chemistry in many years so I don't know any of the current literature. DMacks (talk) 20:22, 24 March 2024 (UTC)[reply]
Hi Xilman: I see that there is also an article called Gold compounds that was created here in 2022 as a copy of the Gold#Chemistry section, and it remains nearly word-for-word identical in both articles. Ideally Gold compounds would be the in-depth article, with a summary here at Gold. Please add AuX information where you think it makes sense and I'd be glad to help organize. –MadeOfAtoms (talk) 04:23, 25 March 2024 (UTC)[reply]
Good idea. The sub-heading might be something simple like "Gaseous compounds". Xilman (talk) 15:20, 25 March 2024 (UTC)[reply]