Stock Market Response to Potash Mine Disasters

IÉSEG Working Paper Series 2017-ACF-02

46 Pages Posted: 4 Mar 2017 Last revised: 6 Mar 2017

See all articles by Oskar Kowalewski

Oskar Kowalewski

IESEG School of Management; LEM - CNRS 9221

Piotr Spiewanowski

Polish Academy of Sciences - Institute of Economics (INE PAN)

Date Written: March 3, 2017


We examine the stock market reaction to natural and man-made disasters in potash mines. We use a sample of 44 mining accidents worldwide over the period 1995-2016. A quarter of the accidents were the result of a natural disaster, such as flooding, that often ended in the closure of the potash mine. The remaining accidents were caused mainly by human error, and almost 50% were work accidents often associated with serious injury or death. On average, mining firms experience a drop in their market value of 0.89% on the day of a disaster. However, we observe a significantly stronger response of the stock market to natural events. Indeed, the regression analysis confirms that the firm’s market loss is significantly related to the seriousness of the accident. On the other hand, we do not find any other micro- or macro-level factors that determine the stock market reaction following a disaster.

Keywords: potash mine, disasters, event study, working accident, catastrophe

JEL Classification: G14, Q27, Q51

Suggested Citation

Kowalewski, Oskar and Spiewanowski, Piotr, Stock Market Response to Potash Mine Disasters (March 3, 2017). IÉSEG Working Paper Series 2017-ACF-02, Available at SSRN: or

Oskar Kowalewski (Contact Author)

IESEG School of Management ( email )

1 Parvis de La Défense
Socle de la Grande Arche
Paris La Défense cedex, 92044


LEM - CNRS 9221 ( email )



Piotr Spiewanowski

Polish Academy of Sciences - Institute of Economics (INE PAN) ( email )

Palace of Culture and Science
Pl. Defilad 1
Warsaw, 00-901


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