<p>From the book <em>Environmental Engineering in South African Mines</em>, The Mine Ventilation Society of South Africa, 1989, pp 451-455.</p>
<p>The equation required is:</p>
<p><span class="math-container">$P \ = \ P_{atm}\cdot e^{\frac{-gMh}{1000R\cdot (273.15+t_{dry})}}$</span></p>
<p>Where:</p>
<ul>
<li><span class="math-container">$P_{atm}$</span> = Atmospheric air pressure</li>
<li><span class="math-container">$t_{dry}$</span> = Dry bulb temperature</li>
<li><span class="math-container">$g$</span> = acceleration due to gravity, 9.8 m/s<sup>2</sup></li>
<li><span class="math-container">$M$</span> = Molar mass of air on Earth, 28.9644 g/mol</li>
<li><span class="math-container">$h$</span> = The difference in elevation, -2735 m</li>
<li><span class="math-container">$R$</span> = The universal gas constant, 8.3144622 J/mol<span class="math-container">$\cdot$</span>K</li>
</ul>
<p>Current data is being taken from the Canadian government weather service website. The nearest town to Kidd Creek is <a href="https://weather.gc.ca/city/pages/on-127_metric_e.html" rel="nofollow noreferrer">Timmins, Ontario</a>, approximately 25 km south.</p>
<p>For 14 December 2022, the dry bulb temperature on the surface is -12.6 °C and the <em>sea level adjusted</em> atmospheric pressure is 1032 hPa (103 200 Pa). Given the depth of the mine and heating of the air due to both auto compression, the geothermal gradient and any diesel powered equipment in the mine, the temperature of the air at the bottom of the exhaust ventilation shaft will most likely be around 30 °C.</p>
<p>The atmospheric pressure at a depth of 2735 m is,</p>
<p><span class="math-container">$P \ = \ 103\ 200\cdot e^{\frac{-9.8(28.9644)(-2735)}{1000(8.31446) (273.15+30)}}$</span> = <span class="math-container">$140\ 400\ Pa = 1404\ hPa = 20.37 \ psi$</span></p>

CC BY-SA 4.0
2022-12-14T11:31:27.470Z
2022-12-17T07:01:42.240Z
2022-12-17T07:01:42.240Z
Fred
<p>At 2735 m (8973 ft) below sea level, the <a href="https://en.wikipedia.org/wiki/Kidd_Mine" rel="nofollow noreferrer">Kidd mine</a> reportedly has the deepest non-marine point of the Earth's surface (since the Kola borehole is sealed). I wonder what the pressure down there is, as compared to 14.696 psi (1013.25 hPa) at sea level and 15.45 psi (1065 hPa) on the shore of the Dead Sea (413 m = 1355 ft below sea level standard).</p>

CC BY-SA 4.0
2022-12-19T03:56:22.777Z
[link](https://en.wikipedia.org/wiki/Mponeng_Gold_Mine)
David García Bodego
CC BY-SA 4.0
2022-12-19T13:07:11.870Z
@DavidGarcíaBodego Your link writes that it's 4 km (2.5 mi) below ground level. The Kidd mine has the deepest point below _sea_ level.
Giovanni
CC BY-SA 4.0
2023-01-29T08:38:19.567Z
@Gionanni, Mine is 600 meters above sea level and depth is 4000 meters, so it is 3400 meters below sea level. I think that this is more than 2735 meters b.s.l.
David García Bodego
<atmosphere-modelling><mining><barometric-pressure>
What is the atmospheric pressure at the deepest point of the Kidd mine?
Giovanni
# What is the atmospheric pressure at the deepest point of the Kidd mine?

(Asked by: username_0 on 2022-12-14)

At 2735 m (8973 ft) below sea level, the [Kidd mine](https://en.wikipedia.org/wiki/Kidd_Mine) reportedly has the deepest non-marine point of the Earth's surface (since the Kola borehole is sealed). I wonder what the pressure down there is, as compared to 14.696 psi (1013.25 hPa) at sea level and 15.45 psi (1065 hPa) on the shore of the Dead Sea (413 m = 1355 ft below sea level standard).

**Tags:** atmosphere-modelling, mining, barometric-pressure

> **Comments:**
> **username_1**: [link](https://en.wikipedia.org/wiki/Mponeng_Gold_Mine)  
> **username_0**: @username_1 Your link writes that it's 4 km (2.5 mi) below ground level. The Kidd mine has the deepest point below _sea_ level.  
> **username_1**: @Gionanni, Mine is 600 meters above sea level and depth is 4000 meters, so it is 3400 meters below sea level. I think that this is more than 2735 meters b.s.l.  

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## 1 answers

### Answer by username_2 on 2022-12-14. Score: 6 | Accepted answer

From the book *Environmental Engineering in South African Mines*, The Mine Ventilation Society of South Africa, 1989, pp 451-455.

The equation required is:

$P \ = \ P\_{atm}\cdot e^{\frac{-gMh}{1000R\cdot (273.15+t\_{dry})}}$

Where:

* $P\_{atm}$ = Atmospheric air pressure
* $t\_{dry}$ = Dry bulb temperature
* $g$ = acceleration due to gravity, 9.8 m/s2
* $M$ = Molar mass of air on Earth, 28.9644 g/mol
* $h$ = The difference in elevation, -2735 m
* $R$ = The universal gas constant, 8.3144622 J/mol$\cdot$K

Current data is being taken from the Canadian government weather service website. The nearest town to Kidd Creek is [Timmins, Ontario](https://weather.gc.ca/city/pages/on-127_metric_e.html), approximately 25 km south.

For 14 December 2022, the dry bulb temperature on the surface is -12.6 °C and the *sea level adjusted* atmospheric pressure is 1032 hPa (103 200 Pa). Given the depth of the mine and heating of the air due to both auto compression, the geothermal gradient and any diesel powered equipment in the mine, the temperature of the air at the bottom of the exhaust ventilation shaft will most likely be around 30 °C.

The atmospheric pressure at a depth of 2735 m is,

$P \ = \ 103\ 200\cdot e^{\frac{-9.8(28.9644)(-2735)}{1000(8.31446) (273.15+30)}}$ = $140\ 400\ Pa = 1404\ hPa = 20.37 \ psi$


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