earth science

Le Puy Mine

Le Puy Mine is a earth science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Le Puy Mine rather than just read about it. In short: The le Puy Mine is an ancient lead mine in the northwestern Massif Central, France. The mine produced mainly silver-bearing galena.

Key takeaways

Le Puy Mine belongs to earth science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Le Puy Mine to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Le Puy Mine from memory before moving on to harder problems.

Reference excerpt

The le Puy Mine is an ancient lead mine in the northwestern Massif Central, France. The mine produced mainly silver-bearing galena.

Geography The Le Puy Mine, in French Les Mines du Puy, was named after the hamlet Le Puy. It is situated roughly 4 km southeast of Nontron on the right-hand side of the D 707 from Nontron to Saint-Pardoux-la-Rivière, at an elevation of 280 m (920 ft) above sealevel. The mine belongs to the commune of Nontron.

Geology The mine is implanted in Neoproterozoic, fine-grained paragneisses structurally belonging to the Saint-Mathieu Dome, an upwarp in the metamorphic basement rocks. The mine followed a 0.50-to-1.20 m-wide (1.6-to-3.9 ft) lode close to the SSE-striking border fault. The vertical to steeply North dipping, mineralized lode is striking N 115 to N 120.

Mineralogy The matrix of the lode consists of quartz and baryte, in some places only of baryte. The lode contains as ore minerals the sulfides galena, sphalerite, marcasite and pyrite as well as the lead alteration mineral cerussite. Galena and sphalerite are silver-bearing. The silver concentration in galena varies between 112 and 400 grams per ton, exceptionally reaching values as high as 1708 g/t. The silver concentration in sphalerite is 946 g/t.

Minerals baryte (BaSO4): common matrix mineral; occurs normally in its leafy habit, in some places forming hemispherical clusters; crystals are up to 1 cm in size. cerussite (PbCO3): fairly rare; formed from galena by alteration; usually encountered in geodes at the top of the lode (oxidation zone). galena (PbS): most common ore mineral; massive or in big cubes; can completely fill veins. marcasite (FeS2): quite common; forms powdery crusts; crystals in cock's comb habit. pyrite (FeS2): less common; associated with galena and baryte. quartz (SiO2): most common matrix mineral; massive; occurs occasionally in geodes; short prisms; fills veins and lodes that are most often strongly jointed. sphalerite (ZnS): less common; forms dense encrustations.

History Works started at the Le Puy Mine in 1899, they lasted with several interruptions till 1935. The main shaft, called Sainte-Louise, was 75 metres deep and deserved 4 levels of excavation. Besides the main shaft there existed two other shafts. By 1901 a 760 m-long (2,490 ft) horizontal drainage shaft was installed, which led from the lowermost excavation level back to daylight. In its course it crossed several veins and also the Pré Granger Lode. The mined ore was washed in place and then taken by horse or ox cart to the train station in Nontron, where it was shipped by train to Marseille or Nantes for further treatment. Today all the shafts including the drainage shaft are filled in and the headframe has been dismantled. The house with its machine room and the bunker containing the dynamite are still standing. Two partially ruined wash basins can also be seen.

Mined tonnage Altogether the Le Puy Mine yielded 1000 (metric) tons of lead at a concentration of 65 to 75%, 100 tons of zinc at a concentration of 45 to 50%, 100 tons of pyrite at a concentration of 35 to 50% and 200 kilograms of silver. Whether there are still extractable resources left below the 75-meter (246 ft) level is not known. There is also the possibility of stratabound ores to be present.

Conclusions The ores formed hydrothermally in a medium temperature range of 300 to 150 °C. The lodes are typical lead-zinc ores; they belong to the sphalerite-pyrite-galena-chalcopyrite association, although in Le Puy chalcopyrite is absent (in neighbouring lodes it is present). The ores most probably were exuded during the cooling process of the Piégut-Pluviers Granodiorite. At the close of the 19th century and the beginning of the 20th century the Le Puy Mine was together with Poullaouen and Huelgoat in Finistère, Vialas in Lozère, Pontgibaud in Puy-de-Dôme and Pontpéan in Ille-et-Vilaine one of the most important lead mines in France.

See also Cantonnier Lode Neuil mine Tabataud Quarry

Literature Floc'h, J.-P. et al. Feuille Nontron. Carte Géologique de la France à 1/50 000. BRGM. Legrand, N., Faure, E. & Lebocey, J. (2008). Minéralogie des Mines du Nontronnais, Dordogne. Le Règne Minéral. Vol. 84, p. 5 – 22.

Worked examples

Example 1 — a first encounter with Le Puy Mine

Start with the simplest possible case. Write down what Le Puy Mine claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In earth science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Le Puy Mine before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Le Puy Mine ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Le Puy Mine

In research: Le Puy Mine appears in earth science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Le Puy Mine in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Le Puy Mine is common in secondary-school and first-year university syllabi. It links to neighbouring topics Buildings and structures in Dordogne, Geography of Dordogne, Geology of France, so understanding it makes those chapters shorter.
In everyday life: Look for Le Puy Mine outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Le Puy Mine in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Le Puy Mine means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Le Puy Mine out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Le Puy Mine in simple terms?

The le Puy Mine is an ancient lead mine in the northwestern Massif Central, France. The mine produced mainly silver-bearing galena.

Why does Le Puy Mine matter?

Because it connects several earth science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Le Puy Mine?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Le Puy Mine.